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/Mips/Mips16HardFloat.cpp b/llvm/lib/Target/Mips/Mips16HardFloat.cpp
index 682ea5c..c310d9491 100644
--- a/llvm/lib/Target/Mips/Mips16HardFloat.cpp
+++ b/llvm/lib/Target/Mips/Mips16HardFloat.cpp
@@ -482,11 +482,11 @@
 // remove the use-soft-float attribute
 static void removeUseSoftFloat(Function &F) {
   AttrBuilder B;
-  DEBUG(errs() << "removing -use-soft-float\n");
+  LLVM_DEBUG(errs() << "removing -use-soft-float\n");
   B.addAttribute("use-soft-float", "false");
   F.removeAttributes(AttributeList::FunctionIndex, B);
   if (F.hasFnAttribute("use-soft-float")) {
-    DEBUG(errs() << "still has -use-soft-float\n");
+    LLVM_DEBUG(errs() << "still has -use-soft-float\n");
   }
   F.addAttributes(AttributeList::FunctionIndex, B);
 }
@@ -510,7 +510,7 @@
 bool Mips16HardFloat::runOnModule(Module &M) {
   auto &TM = static_cast<const MipsTargetMachine &>(
       getAnalysis<TargetPassConfig>().getTM<TargetMachine>());
-  DEBUG(errs() << "Run on Module Mips16HardFloat\n");
+  LLVM_DEBUG(errs() << "Run on Module Mips16HardFloat\n");
   bool Modified = false;
   for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) {
     if (F->hasFnAttribute("nomips16") &&