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/X86/X86OptimizeLEAs.cpp b/llvm/lib/Target/X86/X86OptimizeLEAs.cpp
index 6329375..42db51b 100644
--- a/llvm/lib/Target/X86/X86OptimizeLEAs.cpp
+++ b/llvm/lib/Target/X86/X86OptimizeLEAs.cpp
@@ -541,7 +541,7 @@
     MRI->clearKillFlags(DefMI->getOperand(0).getReg());
 
     ++NumSubstLEAs;
-    DEBUG(dbgs() << "OptimizeLEAs: Candidate to replace: "; MI.dump(););
+    LLVM_DEBUG(dbgs() << "OptimizeLEAs: Candidate to replace: "; MI.dump(););
 
     // Change instruction operands.
     MI.getOperand(MemOpNo + X86::AddrBaseReg)
@@ -553,7 +553,7 @@
     MI.getOperand(MemOpNo + X86::AddrSegmentReg)
         .ChangeToRegister(X86::NoRegister, false);
 
-    DEBUG(dbgs() << "OptimizeLEAs: Replaced by: "; MI.dump(););
+    LLVM_DEBUG(dbgs() << "OptimizeLEAs: Replaced by: "; MI.dump(););
 
     Changed = true;
   }
@@ -649,7 +649,8 @@
         MRI->clearKillFlags(FirstVReg);
 
         ++NumRedundantLEAs;
-        DEBUG(dbgs() << "OptimizeLEAs: Remove redundant LEA: "; Last.dump(););
+        LLVM_DEBUG(dbgs() << "OptimizeLEAs: Remove redundant LEA: ";
+                   Last.dump(););
 
         // By this moment, all of the Last LEA's uses must be replaced. So we
         // can freely remove it.