[gn build] Port 2962f9d

Author: llvmgnsyncbot

llvm/utils/gn/secondary/llvm/tools/llvm-reduce/BUILD.gn

@@ -38,6 +38,7 @@ executable("llvm-reduce") {
     "deltas/ReduceSpecialGlobals.cpp",
     "deltas/ReduceVirtualRegisters.cpp",
     "deltas/SimplifyInstructions.cpp",
+    "deltas/Utils.cpp",
     "llvm-reduce.cpp",
   ]
 }