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/CriticalAntiDepBreaker.cpp b/llvm/lib/CodeGen/CriticalAntiDepBreaker.cpp
index 608fc4b..840e5ed 100644
--- a/llvm/lib/CodeGen/CriticalAntiDepBreaker.cpp
+++ b/llvm/lib/CodeGen/CriticalAntiDepBreaker.cpp
@@ -461,14 +461,14 @@
 
 #ifndef NDEBUG
   {
-    DEBUG(dbgs() << "Critical path has total latency "
-          << (Max->getDepth() + Max->Latency) << "\n");
-    DEBUG(dbgs() << "Available regs:");
+    LLVM_DEBUG(dbgs() << "Critical path has total latency "
+                      << (Max->getDepth() + Max->Latency) << "\n");
+    LLVM_DEBUG(dbgs() << "Available regs:");
     for (unsigned Reg = 0; Reg < TRI->getNumRegs(); ++Reg) {
       if (KillIndices[Reg] == ~0u)
-        DEBUG(dbgs() << " " << printReg(Reg, TRI));
+        LLVM_DEBUG(dbgs() << " " << printReg(Reg, TRI));
     }
-    DEBUG(dbgs() << '\n');
+    LLVM_DEBUG(dbgs() << '\n');
   }
 #endif
 
@@ -645,10 +645,10 @@
                                                      AntiDepReg,
                                                      LastNewReg[AntiDepReg],
                                                      RC, ForbidRegs)) {
-        DEBUG(dbgs() << "Breaking anti-dependence edge on "
-                     << printReg(AntiDepReg, TRI) << " with "
-                     << RegRefs.count(AntiDepReg) << " references"
-                     << " using " << printReg(NewReg, TRI) << "!\n");
+        LLVM_DEBUG(dbgs() << "Breaking anti-dependence edge on "
+                          << printReg(AntiDepReg, TRI) << " with "
+                          << RegRefs.count(AntiDepReg) << " references"
+                          << " using " << printReg(NewReg, TRI) << "!\n");
 
         // Update the references to the old register to refer to the new
         // register.