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/AMDGPU/R600Packetizer.cpp b/llvm/lib/Target/AMDGPU/R600Packetizer.cpp
index 7340318..069e9dc 100644
--- a/llvm/lib/Target/AMDGPU/R600Packetizer.cpp
+++ b/llvm/lib/Target/AMDGPU/R600Packetizer.cpp
@@ -236,7 +236,7 @@
         if (ConsideredInstUsesAlreadyWrittenVectorElement &&
             !TII->isVectorOnly(MI) && VLIW5) {
           isTransSlot = true;
-          DEBUG({
+          LLVM_DEBUG({
             dbgs() << "Considering as Trans Inst :";
             MI.dump();
           });
@@ -249,7 +249,7 @@
     // Are the Constants limitations met ?
     CurrentPacketMIs.push_back(&MI);
     if (!TII->fitsConstReadLimitations(CurrentPacketMIs)) {
-      DEBUG({
+      LLVM_DEBUG({
         dbgs() << "Couldn't pack :\n";
         MI.dump();
         dbgs() << "with the following packets :\n";
@@ -266,7 +266,7 @@
     // Is there a BankSwizzle set that meet Read Port limitations ?
     if (!TII->fitsReadPortLimitations(CurrentPacketMIs,
             PV, BS, isTransSlot)) {
-      DEBUG({
+      LLVM_DEBUG({
         dbgs() << "Couldn't pack :\n";
         MI.dump();
         dbgs() << "with the following packets :\n";