[gn build] Port a3a3e69

Author: llvmgnsyncbot

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

@@ -200,6 +200,7 @@ static_library("LLVMAMDGPUCodeGen") {
     "AMDGPUTargetTransformInfo.cpp",
     "AMDGPUUnifyDivergentExitNodes.cpp",
     "AMDGPUUnifyMetadata.cpp",
+    "AMDGPUWaitSGPRHazards.cpp",
     "GCNCreateVOPD.cpp",
     "GCNDPPCombine.cpp",
     "GCNHazardRecognizer.cpp",