[Modules] Fix potential ODR violations by sinking the DEBUG_TYPE
definition below all of the header #include lines, lib/Transforms/...
edition.

This one is tricky for two reasons. We again have a couple of passes
that define something else before the includes as well. I've sunk their
name macros with the DEBUG_TYPE.

Also, InstCombine contains headers that need DEBUG_TYPE, so now those
headers #define and #undef DEBUG_TYPE around their code, leaving them
well formed modular headers. Fixing these headers was a large motivation
for all of these changes, as "leaky" macros of this form are hard on the
modules implementation.

llvm-svn: 206844
diff --git a/llvm/lib/Transforms/Utils/LowerExpectIntrinsic.cpp b/llvm/lib/Transforms/Utils/LowerExpectIntrinsic.cpp
index 3e61289..ff89e74 100644
--- a/llvm/lib/Transforms/Utils/LowerExpectIntrinsic.cpp
+++ b/llvm/lib/Transforms/Utils/LowerExpectIntrinsic.cpp
@@ -11,7 +11,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-#define DEBUG_TYPE "lower-expect-intrinsic"
 #include "llvm/Transforms/Scalar.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/IR/BasicBlock.h"
@@ -29,6 +28,8 @@
 
 using namespace llvm;
 
+#define DEBUG_TYPE "lower-expect-intrinsic"
+
 STATISTIC(IfHandled, "Number of 'expect' intrinsic instructions handled");
 
 static cl::opt<uint32_t>