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/MSP430/MSP430BranchSelector.cpp b/llvm/lib/Target/MSP430/MSP430BranchSelector.cpp
index 87c320a..2b34954 100644
--- a/llvm/lib/Target/MSP430/MSP430BranchSelector.cpp
+++ b/llvm/lib/Target/MSP430/MSP430BranchSelector.cpp
@@ -138,15 +138,15 @@
         continue;
       }
 
-      DEBUG(dbgs() << "  Found a branch that needs expanding, "
-                   << printMBBReference(*DestBB) << ", Distance "
-                   << BranchDistance << "\n");
+      LLVM_DEBUG(dbgs() << "  Found a branch that needs expanding, "
+                        << printMBBReference(*DestBB) << ", Distance "
+                        << BranchDistance << "\n");
 
       // If JCC is not the last instruction we need to split the MBB.
       if (MI->getOpcode() == MSP430::JCC && std::next(MI) != EE) {
 
-        DEBUG(dbgs() << "  Found a basic block that needs to be split, "
-                     << printMBBReference(*MBB) << "\n");
+        LLVM_DEBUG(dbgs() << "  Found a basic block that needs to be split, "
+                          << printMBBReference(*MBB) << "\n");
 
         // Create a new basic block.
         MachineBasicBlock *NewBB =
@@ -229,7 +229,7 @@
   if (!BranchSelectEnabled)
     return false;
 
-  DEBUG(dbgs() << "\n********** " << getPassName() << " **********\n");
+  LLVM_DEBUG(dbgs() << "\n********** " << getPassName() << " **********\n");
 
   // BlockOffsets - Contains the distance from the beginning of the function to
   // the beginning of each basic block.