Added LLVM_FALLTHROUGH to address warning: this statement may fall through. NFC.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@304646 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Parse/Parser.cpp

@@ -763,6 +763,7 @@ Parser::ParseExternalDeclaration(ParsedAttributesWithRange &attrs,
     }
     // This must be 'export template'. Parse it so we can diagnose our lack
     // of support.
+    LLVM_FALLTHROUGH;
   case tok::kw_using:
   case tok::kw_namespace:
   case tok::kw_typedef:
@@ -1875,6 +1876,7 @@ bool Parser::isTokenEqualOrEqualTypo() {
     Diag(Tok, diag::err_invalid_token_after_declarator_suggest_equal)
         << Kind
         << FixItHint::CreateReplacement(SourceRange(Tok.getLocation()), "=");
+    LLVM_FALLTHROUGH;
   case tok::equal:
     return true;
   }