First step in adding pcmarker intrinsic.  Second step (soon) is adding backend support.

llvm-svn: 20900
diff --git a/llvm/lib/CodeGen/IntrinsicLowering.cpp b/llvm/lib/CodeGen/IntrinsicLowering.cpp
index 3633f96..b665557 100644
--- a/llvm/lib/CodeGen/IntrinsicLowering.cpp
+++ b/llvm/lib/CodeGen/IntrinsicLowering.cpp
@@ -172,6 +172,9 @@
   case Intrinsic::prefetch:
     break;    // Simply strip out prefetches on unsupported architectures
 
+  case Intrinsic::pcmarker:
+    break;    // Simply strip out pcmarker on unsupported architectures
+
   case Intrinsic::dbg_stoppoint:
   case Intrinsic::dbg_region_start:
   case Intrinsic::dbg_region_end: