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/Hexagon/HexagonLoopIdiomRecognition.cpp b/llvm/lib/Target/Hexagon/HexagonLoopIdiomRecognition.cpp
index d0bc2ed..8b22d35 100644
--- a/llvm/lib/Target/Hexagon/HexagonLoopIdiomRecognition.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonLoopIdiomRecognition.cpp
@@ -1758,15 +1758,15 @@
 }
 
 bool PolynomialMultiplyRecognize::recognize() {
-  DEBUG(dbgs() << "Starting PolynomialMultiplyRecognize on loop\n"
-               << *CurLoop << '\n');
+  LLVM_DEBUG(dbgs() << "Starting PolynomialMultiplyRecognize on loop\n"
+                    << *CurLoop << '\n');
   // Restrictions:
   // - The loop must consist of a single block.
   // - The iteration count must be known at compile-time.
   // - The loop must have an induction variable starting from 0, and
   //   incremented in each iteration of the loop.
   BasicBlock *LoopB = CurLoop->getHeader();
-  DEBUG(dbgs() << "Loop header:\n" << *LoopB);
+  LLVM_DEBUG(dbgs() << "Loop header:\n" << *LoopB);
 
   if (LoopB != CurLoop->getLoopLatch())
     return false;
@@ -1788,7 +1788,8 @@
   ParsedValues PV;
   Simplifier PreSimp;
   PV.IterCount = IterCount;
-  DEBUG(dbgs() << "Loop IV: " << *CIV << "\nIterCount: " << IterCount << '\n');
+  LLVM_DEBUG(dbgs() << "Loop IV: " << *CIV << "\nIterCount: " << IterCount
+                    << '\n');
 
   setupPreSimplifier(PreSimp);
 
@@ -1815,7 +1816,7 @@
     Simplifier::Context C(SI);
     Value *T = PreSimp.simplify(C);
     SelectInst *SelI = (T && isa<SelectInst>(T)) ? cast<SelectInst>(T) : SI;
-    DEBUG(dbgs() << "scanSelect(pre-scan): " << PE(C, SelI) << '\n');
+    LLVM_DEBUG(dbgs() << "scanSelect(pre-scan): " << PE(C, SelI) << '\n');
     if (scanSelect(SelI, LoopB, EntryB, CIV, PV, true)) {
       FoundPreScan = true;
       if (SelI != SI) {
@@ -1828,7 +1829,7 @@
   }
 
   if (!FoundPreScan) {
-    DEBUG(dbgs() << "Have not found candidates for pmpy\n");
+    LLVM_DEBUG(dbgs() << "Have not found candidates for pmpy\n");
     return false;
   }
 
@@ -1868,14 +1869,14 @@
     SelectInst *SelI = dyn_cast<SelectInst>(&In);
     if (!SelI)
       continue;
-    DEBUG(dbgs() << "scanSelect: " << *SelI << '\n');
+    LLVM_DEBUG(dbgs() << "scanSelect: " << *SelI << '\n');
     FoundScan = scanSelect(SelI, LoopB, EntryB, CIV, PV, false);
     if (FoundScan)
       break;
   }
   assert(FoundScan);
 
-  DEBUG({
+  LLVM_DEBUG({
     StringRef PP = (PV.M ? "(P+M)" : "P");
     if (!PV.Inv)
       dbgs() << "Found pmpy idiom: R = " << PP << ".Q\n";
@@ -2287,10 +2288,11 @@
 
   NewCall->setDebugLoc(DLoc);
 
-  DEBUG(dbgs() << "  Formed " << (Overlap ? "memmove: " : "memcpy: ")
-               << *NewCall << "\n"
-               << "    from load ptr=" << *LoadEv << " at: " << *LI << "\n"
-               << "    from store ptr=" << *StoreEv << " at: " << *SI << "\n");
+  LLVM_DEBUG(dbgs() << "  Formed " << (Overlap ? "memmove: " : "memcpy: ")
+                    << *NewCall << "\n"
+                    << "    from load ptr=" << *LoadEv << " at: " << *LI << "\n"
+                    << "    from store ptr=" << *StoreEv << " at: " << *SI
+                    << "\n");
 
   return true;
 }