diff --git a/lib/Target/AArch64/MCTargetDesc/AArch64ELFStreamer.cpp b/lib/Target/AArch64/MCTargetDesc/AArch64ELFStreamer.cpp
index d391b750422..204a1abe72b 100644
--- a/lib/Target/AArch64/MCTargetDesc/AArch64ELFStreamer.cpp
+++ b/lib/Target/AArch64/MCTargetDesc/AArch64ELFStreamer.cpp
@@ -60,7 +60,7 @@ AArch64TargetAsmStreamer::AArch64TargetAsmStreamer(MCStreamer &S,
   : AArch64TargetStreamer(S), OS(OS) {}
 
 void AArch64TargetAsmStreamer::emitInst(uint32_t Inst) {
-  OS << "\t.inst\t0x" << utohexstr(Inst) << "\n";
+  OS << "\t.inst\t0x" << Twine::utohexstr(Inst) << "\n";
 }
 
 class AArch64TargetELFStreamer : public AArch64TargetStreamer {
@@ -95,8 +95,6 @@ public:
       : MCELFStreamer(Context, TAB, OS, Emitter), MappingSymbolCounter(0),
         LastEMS(EMS_None) {}
 
-  ~AArch64ELFStreamer() override {}
-
   void ChangeSection(MCSection *Section, const MCExpr *Subsection) override {
     // We have to keep track of the mapping symbol state of any sections we
     // use. Each one should start off as EMS_None, which is provided as the
@@ -117,15 +115,8 @@ public:
   }
 
   void emitInst(uint32_t Inst) {
-    char Buffer[4];
-    const bool LittleEndian = getContext().getAsmInfo()->isLittleEndian();
-
     EmitA64MappingSymbol();
-    for (unsigned II = 0; II != 4; ++II) {
-      const unsigned I = LittleEndian ? (4 - II - 1) : II;
-      Buffer[4 - II - 1] = uint8_t(Inst >> I * CHAR_BIT);
-    }
-    MCELFStreamer::EmitBytes(StringRef(Buffer, 4));
+    MCELFStreamer::EmitIntValue(Inst, 4);
   }
 
   /// This is one of the functions used to emit data into an ELF section, so the
@@ -189,8 +180,6 @@ private:
 
   DenseMap<const MCSection *, ElfMappingSymbol> LastMappingSymbols;
   ElfMappingSymbol LastEMS;
-
-  /// @}
 };
 } // end anonymous namespace
 
diff --git a/lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp b/lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
index 71cc516237f..0eb5a8136e8 100644
--- a/lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
+++ b/lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
@@ -223,7 +223,7 @@ void ARMTargetAsmStreamer::emitInst(uint32_t Inst, char Suffix) {
   OS << "\t.inst";
   if (Suffix)
     OS << "." << Suffix;
-  OS << "\t0x" << utohexstr(Inst) << "\n";
+  OS << "\t0x" << Twine::utohexstr(Inst) << "\n";
 }
 
 void ARMTargetAsmStreamer::emitUnwindRaw(int64_t Offset,
@@ -232,7 +232,7 @@ void ARMTargetAsmStreamer::emitUnwindRaw(int64_t Offset,
   for (SmallVectorImpl<uint8_t>::const_iterator OCI = Opcodes.begin(),
                                                 OCE = Opcodes.end();
        OCI != OCE; ++OCI)
-    OS << ", 0x" << utohexstr(*OCI);
+    OS << ", 0x" << Twine::utohexstr(*OCI);
   OS << '\n';
 }
 
diff --git a/test/MC/AArch64/inst-directive.s b/test/MC/AArch64/inst-directive.s
index 6a4b64eeaaf..3bb620f689d 100644
--- a/test/MC/AArch64/inst-directive.s
+++ b/test/MC/AArch64/inst-directive.s
@@ -15,7 +15,7 @@ aarch64_inst:
 // CHECK-ASM:        .globl  aarch64_inst
 // CHECK-ASM:        .type   aarch64_inst,@function
 // CHECK-ASM: aarch64_inst:
-// CHECK-ASM:        .inst   0x5E104020
+// CHECK-ASM:        .inst   0x5e104020
 
 // CHECK-OBJ: Section {
 // CHECK-OBJ:   Name: .inst.aarch64_inst
diff --git a/test/MC/ARM/inst-directive-emit.s b/test/MC/ARM/inst-directive-emit.s
index 13b7edfa1f3..63fdd15ee38 100644
--- a/test/MC/ARM/inst-directive-emit.s
+++ b/test/MC/ARM/inst-directive-emit.s
@@ -15,6 +15,6 @@ emit_asm:
 @ CHECK: 	.globl	emit_asm
 @ CHECK: 	.type	emit_asm,%function
 @ CHECK: emit_asm:
-@ CHECK: 	inst.w 0xF2400000
-@ CHECK: 	inst.w 0xF2C00000
+@ CHECK: 	inst.w 0xf2400000
+@ CHECK: 	inst.w 0xf2c00000