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/ARM/Thumb2SizeReduction.cpp b/llvm/lib/Target/ARM/Thumb2SizeReduction.cpp
index 115ba65..abf54ba 100644
--- a/llvm/lib/Target/ARM/Thumb2SizeReduction.cpp
+++ b/llvm/lib/Target/ARM/Thumb2SizeReduction.cpp
@@ -610,7 +610,8 @@
   // Transfer MI flags.
   MIB.setMIFlags(MI->getFlags());
 
-  DEBUG(errs() << "Converted 32-bit: " << *MI << "       to 16-bit: " << *MIB);
+  LLVM_DEBUG(errs() << "Converted 32-bit: " << *MI
+                    << "       to 16-bit: " << *MIB);
 
   MBB.erase_instr(MI);
   ++NumLdSts;
@@ -657,7 +658,8 @@
     // Transfer MI flags.
     MIB.setMIFlags(MI->getFlags());
 
-    DEBUG(errs() << "Converted 32-bit: " << *MI << "       to 16-bit: " <<*MIB);
+    LLVM_DEBUG(errs() << "Converted 32-bit: " << *MI
+                      << "       to 16-bit: " << *MIB);
 
     MBB.erase_instr(MI);
     ++NumNarrows;
@@ -826,7 +828,8 @@
   // Transfer MI flags.
   MIB.setMIFlags(MI->getFlags());
 
-  DEBUG(errs() << "Converted 32-bit: " << *MI << "       to 16-bit: " << *MIB);
+  LLVM_DEBUG(errs() << "Converted 32-bit: " << *MI
+                    << "       to 16-bit: " << *MIB);
 
   MBB.erase_instr(MI);
   ++Num2Addrs;
@@ -933,7 +936,8 @@
   // Transfer MI flags.
   MIB.setMIFlags(MI->getFlags());
 
-  DEBUG(errs() << "Converted 32-bit: " << *MI << "       to 16-bit: " << *MIB);
+  LLVM_DEBUG(errs() << "Converted 32-bit: " << *MI
+                    << "       to 16-bit: " << *MIB);
 
   MBB.erase_instr(MI);
   ++NumNarrows;