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

[Saleem Abdulrasool]

  Add a test case.

Hi t.p.northover, dblaikie,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2410?vs=6104&id=6110#toc

Files:
  lib/MC/MCParser/AsmParser.cpp
  test/MC/AsmParser/target-directives.s

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 =
Index: test/MC/AsmParser/target-directives.s
===================================================================
--- /dev/null
+++ test/MC/AsmParser/target-directives.s
@@ -0,0 +1,8 @@
+# RUN: llvm-mc -triple i386-unknown-unknown -filetype obj -o /dev/null 2> %t \
+# RUN:   | FileCheck %s %t
+
+	.code42
+
+# CHECK: unexpected directive .code42
+# CHECK-NOT: unknown directive
+
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