[gn build] Port bd6addc

Author: llvmgnsyncbot

llvm/utils/gn/secondary/llvm/lib/Target/X86/BUILD.gn

@@ -136,6 +136,7 @@ static_library("LLVMX86CodeGen") {
     "X86SpeculativeExecutionSideEffectSuppression.cpp",
     "X86SpeculativeLoadHardening.cpp",
     "X86Subtarget.cpp",
+    "X86SuppressAPXForReloc.cpp",
     "X86TargetMachine.cpp",
     "X86TargetObjectFile.cpp",
     "X86TargetTransformInfo.cpp",