diff --git a/include/llvm/Bitstream/BitstreamWriter.h b/include/llvm/Bitstream/BitstreamWriter.h
index 3954df4897a..56ec99c58ea 100644
--- a/include/llvm/Bitstream/BitstreamWriter.h
+++ b/include/llvm/Bitstream/BitstreamWriter.h
@@ -302,10 +302,8 @@ public:
 
     // If there is a blockinfo for this BlockID, add all the predefined abbrevs
     // to the abbrev list.
-    if (BlockInfo *Info = getBlockInfo(BlockID)) {
-      CurAbbrevs.insert(CurAbbrevs.end(), Info->Abbrevs.begin(),
-                        Info->Abbrevs.end());
-    }
+    if (BlockInfo *Info = getBlockInfo(BlockID))
+      append_range(CurAbbrevs, Info->Abbrevs);
   }
 
   void ExitBlock() {
diff --git a/include/llvm/Support/GenericDomTree.h b/include/llvm/Support/GenericDomTree.h
index 18e08dbcd17..21fd50763b1 100644
--- a/include/llvm/Support/GenericDomTree.h
+++ b/include/llvm/Support/GenericDomTree.h
@@ -564,8 +564,7 @@ protected:
       // made to the CFG), so the PreViewCFG needs all the updates reverse
       // applied.
       SmallVector<UpdateType> AllUpdates(Updates.begin(), Updates.end());
-      for (auto &Update : PostViewUpdates)
-        AllUpdates.push_back(Update);
+      append_range(AllUpdates, PostViewUpdates);
       GraphDiff<NodePtr, IsPostDom> PreViewCFG(AllUpdates,
                                                /*ReverseApplyUpdates=*/true);
       GraphDiff<NodePtr, IsPostDom> PostViewCFG(PostViewUpdates);
diff --git a/tools/llvm-cov/CoverageExporterJson.cpp b/tools/llvm-cov/CoverageExporterJson.cpp
index d1446f379f0..d341abe8dfc 100644
--- a/tools/llvm-cov/CoverageExporterJson.cpp
+++ b/tools/llvm-cov/CoverageExporterJson.cpp
@@ -123,8 +123,7 @@ collectNestedBranches(const coverage::CoverageMapping &Coverage,
     // Recursively collect branches from nested expansions.
     auto NestedExpansions = ExpansionCoverage.getExpansions();
     auto NestedExBranches = collectNestedBranches(Coverage, NestedExpansions);
-    Branches.insert(Branches.end(), NestedExBranches.begin(),
-                    NestedExBranches.end());
+    append_range(Branches, NestedExBranches);
 
     // Add branches from this level of expansion.
     auto ExBranches = ExpansionCoverage.getBranches();
diff --git a/tools/llvm-cov/CoverageExporterLcov.cpp b/tools/llvm-cov/CoverageExporterLcov.cpp
index 99ca037e7b5..6cf5d9285b9 100644
--- a/tools/llvm-cov/CoverageExporterLcov.cpp
+++ b/tools/llvm-cov/CoverageExporterLcov.cpp
@@ -91,8 +91,7 @@ collectNestedBranches(const coverage::CoverageMapping &Coverage,
     auto NestedExpansions = ExpansionCoverage.getExpansions();
     auto NestedExBranches = collectNestedBranches(Coverage, NestedExpansions,
                                                   ViewDepth + 1, SrcLine);
-    Branches.insert(Branches.end(), NestedExBranches.begin(),
-                    NestedExBranches.end());
+    append_range(Branches, NestedExBranches);
 
     // Add branches from this level of expansion.
     auto ExBranches = ExpansionCoverage.getBranches();
@@ -123,7 +122,7 @@ void renderBranchExecutionCounts(raw_ostream &OS,
       collectNestedBranches(Coverage, FileCoverage.getExpansions());
 
   // Append Expansion Branches to Source Branches.
-  Branches.insert(Branches.end(), ExBranches.begin(), ExBranches.end());
+  append_range(Branches, ExBranches);
 
   // Sort branches based on line number to ensure branches corresponding to the
   // same source line are counted together.
diff --git a/tools/llvm-readobj/COFFDumper.cpp b/tools/llvm-readobj/COFFDumper.cpp
index 684967f9339..2a77ebe34bc 100644
--- a/tools/llvm-readobj/COFFDumper.cpp
+++ b/tools/llvm-readobj/COFFDumper.cpp
@@ -593,8 +593,7 @@ void COFFDumper::cacheRelocations() {
   for (const SectionRef &S : Obj->sections()) {
     const coff_section *Section = Obj->getCOFFSection(S);
 
-    for (const RelocationRef &Reloc : S.relocations())
-      RelocMap[Section].push_back(Reloc);
+    append_range(RelocMap[Section], S.relocations());
 
     // Sort relocations by address.
     llvm::sort(RelocMap[Section], [](RelocationRef L, RelocationRef R) {
diff --git a/tools/lto/lto.cpp b/tools/lto/lto.cpp
index 688c7f275e1..e88cb473e95 100644
--- a/tools/lto/lto.cpp
+++ b/tools/lto/lto.cpp
@@ -564,8 +564,7 @@ void thinlto_debug_options(const char *const *options, int number) {
   // if options were requested, set them
   if (number && options) {
     std::vector<const char *> CodegenArgv(1, "libLTO");
-    for (auto Arg : ArrayRef<const char *>(options, number))
-      CodegenArgv.push_back(Arg);
+    append_range(CodegenArgv, ArrayRef<const char *>(options, number));
     cl::ParseCommandLineOptions(CodegenArgv.size(), CodegenArgv.data());
   }
 }
diff --git a/tools/obj2yaml/wasm2yaml.cpp b/tools/obj2yaml/wasm2yaml.cpp
index 205ec1e0163..2d7ff3b2f9a 100644
--- a/tools/obj2yaml/wasm2yaml.cpp
+++ b/tools/obj2yaml/wasm2yaml.cpp
@@ -329,9 +329,7 @@ ErrorOr<WasmYAML::Object *> WasmDumper::dump() {
         WasmYAML::ElemSegment Seg;
         Seg.TableIndex = Segment.TableIndex;
         Seg.Offset = Segment.Offset;
-        for (auto &Func : Segment.Functions) {
-          Seg.Functions.push_back(Func);
-        }
+        append_range(Seg.Functions, Segment.Functions);
         ElemSec->Segments.push_back(Seg);
       }
       S = std::move(ElemSec);
diff --git a/utils/FileCheck/FileCheck.cpp b/utils/FileCheck/FileCheck.cpp
index be277566620..d59607a2b93 100644
--- a/utils/FileCheck/FileCheck.cpp
+++ b/utils/FileCheck/FileCheck.cpp
@@ -745,14 +745,11 @@ int main(int argc, char **argv) {
   }
 
   FileCheckRequest Req;
-  for (StringRef Prefix : CheckPrefixes)
-    Req.CheckPrefixes.push_back(Prefix);
+  append_range(Req.CheckPrefixes, CheckPrefixes);
 
-  for (StringRef Prefix : CommentPrefixes)
-    Req.CommentPrefixes.push_back(Prefix);
+  append_range(Req.CommentPrefixes, CommentPrefixes);
 
-  for (StringRef CheckNot : ImplicitCheckNot)
-    Req.ImplicitCheckNot.push_back(CheckNot);
+  append_range(Req.ImplicitCheckNot, ImplicitCheckNot);
 
   bool GlobalDefineError = false;
   for (StringRef G : GlobalDefines) {