Sink some IntrinsicInst.h and Intrinsics.h out of llvm/include

Many of these uses can get by with forward declarations. Hopefully this
speeds up compilation after adding a single intrinsic.

llvm-svn: 312759
diff --git a/llvm/lib/CodeGen/ScalarizeMaskedMemIntrin.cpp b/llvm/lib/CodeGen/ScalarizeMaskedMemIntrin.cpp
index 07b43a8..da3e454 100644
--- a/llvm/lib/CodeGen/ScalarizeMaskedMemIntrin.cpp
+++ b/llvm/lib/CodeGen/ScalarizeMaskedMemIntrin.cpp
@@ -16,6 +16,7 @@
 
 #include "llvm/Analysis/TargetTransformInfo.h"
 #include "llvm/IR/IRBuilder.h"
+#include "llvm/IR/IntrinsicInst.h"
 #include "llvm/Target/TargetSubtargetInfo.h"
 
 using namespace llvm;