[PATCH] MC: do not try to parse invalid handled directives

[Saleem Abdulrasool]

Hi t.p.northover,

If the target specific parser handles the directive and there is an error, do
not try to fall back to the common directive handling.

http://llvm-reviews.chandlerc.com/D2410

Files:
  lib/MC/MCParser/AsmParser.cpp

Index: lib/MC/MCParser/AsmParser.cpp
===================================================================
--- lib/MC/MCParser/AsmParser.cpp
+++ lib/MC/MCParser/AsmParser.cpp
@@ -1327,6 +1327,9 @@
     if (!getTargetParser().ParseDirective(ID))
       return false;
 
+    if (HadError)
+      return false;
+
     // Next, check the extention directive map to see if any extension has
     // registered itself to parse this directive.
     std::pair<MCAsmParserExtension *, DirectiveHandler> Handler =
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