[gn build] Manually port c7eb846

Since the bot is broken due to hwasan issues, it's not auto updating the file lists.

Author: aeubanks

llvm/utils/gn/secondary/llvm/lib/Target/AMDGPU/Utils/BUILD.gn

@@ -25,7 +25,6 @@ static_library("Utils") {
   sources = [
     "AMDGPUAsmUtils.cpp",
     "AMDGPUBaseInfo.cpp",
-    "AMDGPULDSUtils.cpp",
     "AMDGPUMemoryUtils.cpp",
     "AMDGPUPALMetadata.cpp",
     "AMDKernelCodeTUtils.cpp",