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/Target/PowerPC/PPCHazardRecognizers.cpp b/llvm/lib/Target/PowerPC/PPCHazardRecognizers.cpp
index 4c718f8..5512204 100644
--- a/llvm/lib/Target/PowerPC/PPCHazardRecognizers.cpp
+++ b/llvm/lib/Target/PowerPC/PPCHazardRecognizers.cpp
@@ -180,9 +180,9 @@
       CurGroup.clear();
       CurSlots = CurBranches = 0;
     } else {
-      DEBUG(dbgs() << "**** Adding to dispatch group: SU(" <<
-                      SU->NodeNum << "): ");
-      DEBUG(DAG->dumpNode(SU));
+      LLVM_DEBUG(dbgs() << "**** Adding to dispatch group: SU(" << SU->NodeNum
+                        << "): ");
+      LLVM_DEBUG(DAG->dumpNode(SU));
 
       unsigned NSlots;
       bool MustBeFirst = mustComeFirst(MCID, NSlots);
@@ -268,7 +268,7 @@
 }
 
 void PPCHazardRecognizer970::EndDispatchGroup() {
-  DEBUG(errs() << "=== Start of dispatch group\n");
+  LLVM_DEBUG(errs() << "=== Start of dispatch group\n");
   NumIssued = 0;
 
   // Structural hazard info.