Fix -fno-gnu-inline-asm doesn't catch file scope asm

[steven_wu]

Summary

FileScopeAsm should be treated the same as funcion level inline asm.
-fno-gnu-inline-asm should trigger an error if file scope asm is used.
I missed this case from r226340. This should not affect ms-extension
because it is not allowed in the file scope.

[rnk]

lgtm

[steven_wu]

Thanks. Committed in r236044.

lib/Parse/Parser.cpp

 ///
 /// [GNU] simple-asm-expr:
 ///         'asm' '(' asm-string-literal ')'
 ///
 ExprResult Parser::ParseSimpleAsm(SourceLocation *EndLoc) {
   assert(Tok.is(tok::kw_asm) && "Not an asm!");
   SourceLocation Loc = ConsumeToken();
 
+  // Check if GNU-styple InlineAsm is disabled.
+  if (!getLangOpts().GNUAsm)
+    Diag(Loc, diag::err_gnu_inline_asm_disabled);
+
   if (Tok.is(tok::kw_volatile)) {
     // Remove from the end of 'asm' to the end of 'volatile'.
     SourceRange RemovalRange(PP.getLocForEndOfToken(Loc),
                              PP.getLocForEndOfToken(Tok.getLocation()));
 
     Diag(Tok, diag::warn_file_asm_volatile)
       << FixItHint::CreateRemoval(RemovalRange);
     ConsumeToken();

test/Parser/no-gnu-inline-asm.c

 // RUN: %clang_cc1 %s -triple i686-apple-darwin -verify -fsyntax-only -fno-gnu-inline-asm
 
+asm ("INST r1, 0"); // expected-error {{GNU-style inline assembly is disabled}}
 void f (void) {
   long long foo = 0, bar;
   asm volatile("INST %0, %1" : "=r"(foo) : "r"(bar)); // expected-error {{GNU-style inline assembly is disabled}}
   return;
 }