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/ReachingDefAnalysis.cpp b/llvm/lib/CodeGen/ReachingDefAnalysis.cpp
index 31eb8c9..050fef5 100644
--- a/llvm/lib/CodeGen/ReachingDefAnalysis.cpp
+++ b/llvm/lib/CodeGen/ReachingDefAnalysis.cpp
@@ -47,7 +47,7 @@
         MBBReachingDefs[MBBNumber][*Unit].push_back(LiveRegs[*Unit]);
       }
     }
-    DEBUG(dbgs() << printMBBReference(*MBB) << ": entry\n");
+    LLVM_DEBUG(dbgs() << printMBBReference(*MBB) << ": entry\n");
     return;
   }
 
@@ -69,9 +69,9 @@
     }
   }
 
-  DEBUG(dbgs() << printMBBReference(*MBB)
-               << (!TraversedMBB.IsDone ? ": incomplete\n"
-                                        : ": all preds known\n"));
+  LLVM_DEBUG(dbgs() << printMBBReference(*MBB)
+                    << (!TraversedMBB.IsDone ? ": incomplete\n"
+                                             : ": all preds known\n"));
 }
 
 void ReachingDefAnalysis::leaveBasicBlock(
@@ -109,8 +109,8 @@
       continue;
     for (MCRegUnitIterator Unit(MO.getReg(), TRI); Unit.isValid(); ++Unit) {
       // This instruction explicitly defines the current reg unit.
-      DEBUG(dbgs() << printReg(MO.getReg(), TRI) << ":\t" << CurInstr << '\t'
-                   << *MI);
+      LLVM_DEBUG(dbgs() << printReg(MO.getReg(), TRI) << ":\t" << CurInstr
+                        << '\t' << *MI);
 
       // How many instructions since this reg unit was last written?
       LiveRegs[*Unit] = CurInstr;
@@ -142,7 +142,7 @@
 
   MBBReachingDefs.resize(mf.getNumBlockIDs());
 
-  DEBUG(dbgs() << "********** REACHING DEFINITION ANALYSIS **********\n");
+  LLVM_DEBUG(dbgs() << "********** REACHING DEFINITION ANALYSIS **********\n");
 
   // Initialize the MBBOutRegsInfos
   MBBOutRegsInfos.resize(mf.getNumBlockIDs());