[IR][CodeGen] Remove dependency on EVT from IR/Function.cpp. Move EVT to CodeGen layer.

Currently EVT is in the IR layer only because of Function.cpp needing a very small piece of the functionality of EVT::getEVTString(). The rest of EVT is used in codegen making CodeGen a better place for it.

The previous code converted a Type* to EVT and then called getEVTString. This was only expected to handle the primitive types from Type*. Since there only a few primitive types, we can just print them as strings directly.

Differential Revision: https://reviews.llvm.org/D45017

llvm-svn: 328806
diff --git a/llvm/lib/CodeGen/SelectionDAG/StatepointLowering.h b/llvm/lib/CodeGen/SelectionDAG/StatepointLowering.h
index 51bb450..372c82a 100644
--- a/llvm/lib/CodeGen/SelectionDAG/StatepointLowering.h
+++ b/llvm/lib/CodeGen/SelectionDAG/StatepointLowering.h
@@ -20,7 +20,7 @@
 #include "llvm/ADT/SmallBitVector.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/CodeGen/SelectionDAGNodes.h"
-#include "llvm/IR/ValueTypes.h"
+#include "llvm/CodeGen/ValueTypes.h"
 #include <cassert>
 
 namespace llvm {