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/Transforms/Scalar/Float2Int.cpp b/llvm/lib/Transforms/Scalar/Float2Int.cpp
index b105ece..f2828e8 100644
--- a/llvm/lib/Transforms/Scalar/Float2Int.cpp
+++ b/llvm/lib/Transforms/Scalar/Float2Int.cpp
@@ -138,7 +138,7 @@
 
 // Helper - mark I as having been traversed, having range R.
 void Float2IntPass::seen(Instruction *I, ConstantRange R) {
-  DEBUG(dbgs() << "F2I: " << *I << ":" << R << "\n");
+  LLVM_DEBUG(dbgs() << "F2I: " << *I << ":" << R << "\n");
   auto IT = SeenInsts.find(I);
   if (IT != SeenInsts.end())
     IT->second = std::move(R);
@@ -359,7 +359,7 @@
         for (User *U : I->users()) {
           Instruction *UI = dyn_cast<Instruction>(U);
           if (!UI || SeenInsts.find(UI) == SeenInsts.end()) {
-            DEBUG(dbgs() << "F2I: Failing because of " << *U << "\n");
+            LLVM_DEBUG(dbgs() << "F2I: Failing because of " << *U << "\n");
             Fail = true;
             break;
           }
@@ -380,7 +380,7 @@
     // lower limits, plus one so it can be signed.
     unsigned MinBW = std::max(R.getLower().getMinSignedBits(),
                               R.getUpper().getMinSignedBits()) + 1;
-    DEBUG(dbgs() << "F2I: MinBitwidth=" << MinBW << ", R: " << R << "\n");
+    LLVM_DEBUG(dbgs() << "F2I: MinBitwidth=" << MinBW << ", R: " << R << "\n");
 
     // If we've run off the realms of the exactly representable integers,
     // the floating point result will differ from an integer approximation.
@@ -391,11 +391,12 @@
     unsigned MaxRepresentableBits
       = APFloat::semanticsPrecision(ConvertedToTy->getFltSemantics()) - 1;
     if (MinBW > MaxRepresentableBits) {
-      DEBUG(dbgs() << "F2I: Value not guaranteed to be representable!\n");
+      LLVM_DEBUG(dbgs() << "F2I: Value not guaranteed to be representable!\n");
       continue;
     }
     if (MinBW > 64) {
-      DEBUG(dbgs() << "F2I: Value requires more than 64 bits to represent!\n");
+      LLVM_DEBUG(
+          dbgs() << "F2I: Value requires more than 64 bits to represent!\n");
       continue;
     }
 
@@ -490,7 +491,7 @@
 }
 
 bool Float2IntPass::runImpl(Function &F) {
-  DEBUG(dbgs() << "F2I: Looking at function " << F.getName() << "\n");
+  LLVM_DEBUG(dbgs() << "F2I: Looking at function " << F.getName() << "\n");
   // Clear out all state.
   ECs = EquivalenceClasses<Instruction*>();
   SeenInsts.clear();