[gn build] Port 9a82f74

Author: llvmgnsyncbot

llvm/utils/gn/secondary/clang/lib/Sema/BUILD.gn

@@ -43,6 +43,7 @@ static_library("Sema") {
     "CodeCompleteConsumer.cpp",
     "DeclSpec.cpp",
     "DelayedDiagnostic.cpp",
+    "HLSLBuiltinTypeDeclBuilder.cpp",
     "HLSLExternalSemaSource.cpp",
     "HeuristicResolver.cpp",
     "IdentifierResolver.cpp",