[gn build] Port 8ce5a32

Author: llvmgnsyncbot

llvm/utils/gn/secondary/llvm/utils/TableGen/Common/BUILD.gn

@@ -28,6 +28,7 @@ static_library("Common") {
     "PredicateExpander.cpp",
     "SubtargetFeatureInfo.cpp",
     "Types.cpp",
+    "Utils.cpp",
     "VarLenCodeEmitterGen.cpp",
   ]
 }