[Modules] Remove potential ODR violations by sinking the DEBUG_TYPE

define below all header includes in the lib/CodeGen/... tree. While the
current modules implementation doesn't check for this kind of ODR
violation yet, it is likely to grow support for it in the future. It
also removes one layer of macro pollution across all the included
headers.

Other sub-trees will follow.

llvm-svn: 206837

llvm/lib/CodeGen/RegAllocBase.cpp

@@ -12,7 +12,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-#define DEBUG_TYPE "regalloc"
 #include "RegAllocBase.h"
 #include "Spiller.h"
 #include "llvm/ADT/Statistic.h"
@@ -35,6 +34,8 @@
 
 using namespace llvm;
 
+#define DEBUG_TYPE "regalloc"
+
 STATISTIC(NumNewQueued    , "Number of new live ranges queued");
 
 // Temporary verification option until we can put verification inside