MC/AsmParser: Add basic support for macro instantiation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108653 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/MC/AsmParser/macros-parsing.s b/test/MC/AsmParser/macros-parsing.s
index ad19505..cac67aa 100644
--- a/test/MC/AsmParser/macros-parsing.s
+++ b/test/MC/AsmParser/macros-parsing.s
@@ -8,7 +8,7 @@
 // CHECK-ERRORS: 9:1: warning: ignoring directive for now
 .test0
 .macros_on
-// CHECK-ERRORS: 12:1: error: macros are not yet supported
+
 .test0
 
 // CHECK-ERRORS: macro '.test0' is already defined