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/IPO/Internalize.cpp b/llvm/lib/Transforms/IPO/Internalize.cpp
index 26db146..a6542d2 100644
--- a/llvm/lib/Transforms/IPO/Internalize.cpp
+++ b/llvm/lib/Transforms/IPO/Internalize.cpp
@@ -192,7 +192,7 @@
       ExternalNode->removeOneAbstractEdgeTo((*CG)[&I]);
 
     ++NumFunctions;
-    DEBUG(dbgs() << "Internalizing func " << I.getName() << "\n");
+    LLVM_DEBUG(dbgs() << "Internalizing func " << I.getName() << "\n");
   }
 
   // Never internalize the llvm.used symbol.  It is used to implement
@@ -221,7 +221,7 @@
     Changed = true;
 
     ++NumGlobals;
-    DEBUG(dbgs() << "Internalized gvar " << GV.getName() << "\n");
+    LLVM_DEBUG(dbgs() << "Internalized gvar " << GV.getName() << "\n");
   }
 
   // Mark all aliases that are not in the api as internal as well.
@@ -231,7 +231,7 @@
     Changed = true;
 
     ++NumAliases;
-    DEBUG(dbgs() << "Internalized alias " << GA.getName() << "\n");
+    LLVM_DEBUG(dbgs() << "Internalized alias " << GA.getName() << "\n");
   }
 
   return Changed;