More cleanups. Add test.

Author: Prabhuk

clang/lib/Basic/Targets/X86.h

@@ -851,16 +851,6 @@ class LLVM_LIBRARY_VISIBILITY UEFIX86_64TargetInfo
                           "i64:64-i128:128-f80:128-n8:16:32:64-S128");
   }
 
-  CallingConvCheckResult checkCallingConvention(CallingConv CC) const override {
-    switch (CC) {
-    case CC_C:
-    case CC_Win64:
-      return CCCR_OK;
-    default:
-      return CCCR_Warning;
-    }
-  }
-
   TargetInfo::CallingConvKind
   getCallingConvKind(bool ClangABICompat4) const override {
     return CCK_MicrosoftWin64;

clang/test/Preprocessor/init.c

@@ -2835,6 +2835,7 @@
 // RISCV64-LINUX: #define unix 1
 
 // RUN: %clang_cc1 -dM -triple=x86_64-uefi -E /dev/null | FileCheck -match-full-lines -check-prefix UEFI %s
+// RUN: %clang_cc1 -dM -triple=x86_64-unknown-uefi -E /dev/null | FileCheck -match-full-lines -check-prefix UEFI %s
 
 // UEFI: #define __UEFI__ 1