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/tools/llvm-mca/Backend.cpp b/llvm/tools/llvm-mca/Backend.cpp
index de34510..4e6ec48 100644
--- a/llvm/tools/llvm-mca/Backend.cpp
+++ b/llvm/tools/llvm-mca/Backend.cpp
@@ -48,7 +48,7 @@
 }
 
 void Backend::notifyCycleBegin(unsigned Cycle) {
-  DEBUG(dbgs() << "[E] Cycle begin: " << Cycle << '\n');
+  LLVM_DEBUG(dbgs() << "[E] Cycle begin: " << Cycle << '\n');
   for (HWEventListener *Listener : Listeners)
     Listener->onCycleBegin();
 
@@ -67,8 +67,8 @@
 }
 
 void Backend::notifyResourceAvailable(const ResourceRef &RR) {
-  DEBUG(dbgs() << "[E] Resource Available: [" << RR.first << '.' << RR.second
-               << "]\n");
+  LLVM_DEBUG(dbgs() << "[E] Resource Available: [" << RR.first << '.'
+                    << RR.second << "]\n");
   for (HWEventListener *Listener : Listeners)
     Listener->onResourceAvailable(RR);
 }
@@ -84,7 +84,7 @@
 }
 
 void Backend::notifyCycleEnd(unsigned Cycle) {
-  DEBUG(dbgs() << "[E] Cycle end: " << Cycle << "\n\n");
+  LLVM_DEBUG(dbgs() << "[E] Cycle end: " << Cycle << "\n\n");
   for (HWEventListener *Listener : Listeners)
     Listener->onCycleEnd();
 }