Add llvm-gsymutil to the Bazel build files.

Differential Revision: https://reviews.llvm.org/D135568

utils/bazel/llvm-project-overlay/llvm/BUILD.bazel

@@ -497,6 +497,22 @@ cc_library(
     ],
 )
 
+cc_library(
+    name = "DebugInfoGSYM",
+    srcs = glob([
+        "lib/DebugInfo/GSYM/*.cpp",
+        "lib/DebugInfo/GSYM/*.h",
+    ]),
+    hdrs = glob(["include/llvm/DebugInfo/GSYM/*.h"]),
+    copts = llvm_copts,
+    deps = [
+        ":DebugInfoDWARF",
+        ":MC",
+        ":Object",
+        ":Support",
+    ],
+)
+
 cc_library(
     name = "Symbolize",
     srcs = glob([
@@ -3112,6 +3128,25 @@ cc_binary(
     ],
 )
 
+cc_binary(
+    name = "llvm-gsymutil",
+    srcs = glob([
+        "tools/llvm-gsymutil/*.cpp",
+        "tools/llvm-gsymutil/*.h",
+    ]),
+    copts = llvm_copts,
+    stamp = 0,
+    deps = [
+        ":AllTargetsCodeGens",
+        ":DebugInfoDWARF",
+        ":DebugInfoGSYM",
+        ":MC",
+        ":Object",
+        ":Support",
+        ":Target",
+    ],
+)
+
 gentbl(
     name = "IfsOptionsTableGen",
     strip_include_prefix = "tools/llvm-ifs",