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/ScoreboardHazardRecognizer.cpp b/llvm/lib/CodeGen/ScoreboardHazardRecognizer.cpp
index 1364c9d..b8bfe69 100644
--- a/llvm/lib/CodeGen/ScoreboardHazardRecognizer.cpp
+++ b/llvm/lib/CodeGen/ScoreboardHazardRecognizer.cpp
@@ -69,12 +69,12 @@
 
   // If MaxLookAhead is not set above, then we are not enabled.
   if (!isEnabled())
-    DEBUG(dbgs() << "Disabled scoreboard hazard recognizer\n");
+    LLVM_DEBUG(dbgs() << "Disabled scoreboard hazard recognizer\n");
   else {
     // A nonempty itinerary must have a SchedModel.
     IssueWidth = ItinData->SchedModel.IssueWidth;
-    DEBUG(dbgs() << "Using scoreboard hazard recognizer: Depth = "
-          << ScoreboardDepth << '\n');
+    LLVM_DEBUG(dbgs() << "Using scoreboard hazard recognizer: Depth = "
+                      << ScoreboardDepth << '\n');
   }
 }
 
@@ -156,9 +156,9 @@
       }
 
       if (!freeUnits) {
-        DEBUG(dbgs() << "*** Hazard in cycle +" << StageCycle << ", ");
-        DEBUG(dbgs() << "SU(" << SU->NodeNum << "): ");
-        DEBUG(DAG->dumpNode(SU));
+        LLVM_DEBUG(dbgs() << "*** Hazard in cycle +" << StageCycle << ", ");
+        LLVM_DEBUG(dbgs() << "SU(" << SU->NodeNum << "): ");
+        LLVM_DEBUG(DAG->dumpNode(SU));
         return Hazard;
       }
     }
@@ -224,8 +224,8 @@
     cycle += IS->getNextCycles();
   }
 
-  DEBUG(ReservedScoreboard.dump());
-  DEBUG(RequiredScoreboard.dump());
+  LLVM_DEBUG(ReservedScoreboard.dump());
+  LLVM_DEBUG(RequiredScoreboard.dump());
 }
 
 void ScoreboardHazardRecognizer::AdvanceCycle() {