Make the wording in of the "expected identifier" error in the .macro directive

consistent with the other "expected identifier" errors.
Extracted from the Andy/PaX patch. I added the test.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162291 91177308-0d34-0410-b5e6-96231b3b80d8

lib/MC/MCParser/AsmParser.cpp

@@ -3071,14 +3071,14 @@ bool GenericAsmParser::ParseDirectiveMacro(StringRef Directive,
                                            SMLoc DirectiveLoc) {
   StringRef Name;
   if (getParser().ParseIdentifier(Name))
-    return TokError("expected identifier in directive");
+    return TokError("expected identifier in '.macro' directive");
 
   MacroParameters Parameters;
   if (getLexer().isNot(AsmToken::EndOfStatement)) {
     for (;;) {
       MacroParameter Parameter;
       if (getParser().ParseIdentifier(Parameter))
-        return TokError("expected identifier in directive");
+        return TokError("expected identifier in '.macro' directive");
       Parameters.push_back(Parameter);
 
       if (getLexer().isNot(AsmToken::Comma))

test/MC/AsmParser/bad-macro.s

@@ -0,0 +1,9 @@
+// RUN: not llvm-mc -triple x86_64-apple-darwin10 %s 2>&1 | FileCheck %s
+
+.macro 23
+
+// CHECK: expected identifier in '.macro' directive
+
+.macro abc 33
+
+// CHECK: expected identifier in '.macro' directive