Rename DEBUG macro to LLVM_DEBUG.
    
The DEBUG() macro is very generic so it might clash with other projects.
The renaming was done as follows:
- git grep -l 'DEBUG' | xargs sed -i 's/\bDEBUG\s\?(/LLVM_DEBUG(/g'
- git diff -U0 master | ../clang/tools/clang-format/clang-format-diff.py -i -p1 -style LLVM
- Manual change to APInt
- Manually chage DOCS as regex doesn't match it.

In the transition period the DEBUG() macro is still present and aliased
to the LLVM_DEBUG() one.

Differential Revision: https://reviews.llvm.org/D43624

llvm-svn: 332240
diff --git a/llvm/lib/Transforms/Scalar/LoopSink.cpp b/llvm/lib/Transforms/Scalar/LoopSink.cpp
index a2983e6..731506d 100644
--- a/llvm/lib/Transforms/Scalar/LoopSink.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopSink.cpp
@@ -224,11 +224,11 @@
     }
     // Replaces uses of I with IC in blocks dominated by N
     replaceDominatedUsesWith(&I, IC, DT, N);
-    DEBUG(dbgs() << "Sinking a clone of " << I << " To: " << N->getName()
-                 << '\n');
+    LLVM_DEBUG(dbgs() << "Sinking a clone of " << I << " To: " << N->getName()
+                      << '\n');
     NumLoopSunkCloned++;
   }
-  DEBUG(dbgs() << "Sinking " << I << " To: " << MoveBB->getName() << '\n');
+  LLVM_DEBUG(dbgs() << "Sinking " << I << " To: " << MoveBB->getName() << '\n');
   NumLoopSunk++;
   I.moveBefore(&*MoveBB->getFirstInsertionPt());