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/CodeGen/AtomicExpandPass.cpp b/llvm/lib/CodeGen/AtomicExpandPass.cpp
index 7042bc9..460e705 100644
--- a/llvm/lib/CodeGen/AtomicExpandPass.cpp
+++ b/llvm/lib/CodeGen/AtomicExpandPass.cpp
@@ -379,8 +379,8 @@
   NewLI->setAlignment(LI->getAlignment());
   NewLI->setVolatile(LI->isVolatile());
   NewLI->setAtomic(LI->getOrdering(), LI->getSyncScopeID());
-  DEBUG(dbgs() << "Replaced " << *LI << " with " << *NewLI << "\n");
-  
+  LLVM_DEBUG(dbgs() << "Replaced " << *LI << " with " << *NewLI << "\n");
+
   Value *NewVal = Builder.CreateBitCast(NewLI, LI->getType());
   LI->replaceAllUsesWith(NewVal);
   LI->eraseFromParent();
@@ -462,7 +462,7 @@
   NewSI->setAlignment(SI->getAlignment());
   NewSI->setVolatile(SI->isVolatile());
   NewSI->setAtomic(SI->getOrdering(), SI->getSyncScopeID());
-  DEBUG(dbgs() << "Replaced " << *SI << " with " << *NewSI << "\n");
+  LLVM_DEBUG(dbgs() << "Replaced " << *SI << " with " << *NewSI << "\n");
   SI->eraseFromParent();
   return NewSI;
 }
@@ -943,7 +943,7 @@
                                             CI->getSyncScopeID());
   NewCI->setVolatile(CI->isVolatile());
   NewCI->setWeak(CI->isWeak());
-  DEBUG(dbgs() << "Replaced " << *CI << " with " << *NewCI << "\n");
+  LLVM_DEBUG(dbgs() << "Replaced " << *CI << " with " << *NewCI << "\n");
 
   Value *OldVal = Builder.CreateExtractValue(NewCI, 0);
   Value *Succ = Builder.CreateExtractValue(NewCI, 1);