[X86] Add .intel_syntax noprefix directive to intel-syntax x86 asm output

Patch by: michael.zuckerman@intel.com
Differential Revision: http://reviews.llvm.org/D11223

llvm-svn: 242886
diff --git a/llvm/lib/MC/MCStreamer.cpp b/llvm/lib/MC/MCStreamer.cpp
index 7fbbbd9..a25cdfa 100644
--- a/llvm/lib/MC/MCStreamer.cpp
+++ b/llvm/lib/MC/MCStreamer.cpp
@@ -467,6 +467,8 @@
     report_fatal_error("Chained unwind areas can't have handlers!");
 }
 
+void MCStreamer::EmitSyntaxDirective() {}
+
 void MCStreamer::EmitWinCFIPushReg(unsigned Register) {
   EnsureValidWinFrameInfo();