[gn build] Port eb76404

Author: pcc

llvm/utils/gn/secondary/llvm/lib/Target/AArch64/BUILD.gn

@@ -174,6 +174,7 @@ static_library("LLVMAArch64CodeGen") {
     "GISel/AArch64PostSelectOptimize.cpp",
     "GISel/AArch64PreLegalizerCombiner.cpp",
     "GISel/AArch64RegisterBankInfo.cpp",
+    "MachineSMEABIPass.cpp",
     "SMEABIPass.cpp",
     "SMEPeepholeOpt.cpp",
     "SVEIntrinsicOpts.cpp",