[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/Scalar/ScalarReplAggregates.cpp b/llvm/lib/Transforms/Scalar/ScalarReplAggregates.cpp
index e7b5ab2..6c8f242 100644
--- a/llvm/lib/Transforms/Scalar/ScalarReplAggregates.cpp
+++ b/llvm/lib/Transforms/Scalar/ScalarReplAggregates.cpp
@@ -19,7 +19,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-#define DEBUG_TYPE "scalarrepl"
 #include "llvm/Transforms/Scalar.h"
 #include "llvm/ADT/SetVector.h"
 #include "llvm/ADT/SmallVector.h"
@@ -52,6 +51,8 @@
 #include "llvm/Transforms/Utils/SSAUpdater.h"
 using namespace llvm;
 
+#define DEBUG_TYPE "scalarrepl"
+
 STATISTIC(NumReplaced,  "Number of allocas broken up");
 STATISTIC(NumPromoted,  "Number of allocas promoted");
 STATISTIC(NumAdjusted,  "Number of scalar allocas adjusted to allow promotion");