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/CodeGen/RegUsageInfoCollector.cpp b/llvm/lib/CodeGen/RegUsageInfoCollector.cpp
index d934fa9..6a0f26b 100644
--- a/llvm/lib/CodeGen/RegUsageInfoCollector.cpp
+++ b/llvm/lib/CodeGen/RegUsageInfoCollector.cpp
@@ -83,9 +83,9 @@
   const TargetRegisterInfo *TRI = MF.getSubtarget().getRegisterInfo();
   const TargetMachine &TM = MF.getTarget();
 
-  DEBUG(dbgs() << " -------------------- " << getPassName()
-               << " -------------------- \n");
-  DEBUG(dbgs() << "Function Name : " << MF.getName() << "\n");
+  LLVM_DEBUG(dbgs() << " -------------------- " << getPassName()
+                    << " -------------------- \n");
+  LLVM_DEBUG(dbgs() << "Function Name : " << MF.getName() << "\n");
 
   std::vector<uint32_t> RegMask;
 
@@ -101,7 +101,7 @@
 
   PRUI->setTargetMachine(&TM);
 
-  DEBUG(dbgs() << "Clobbered Registers: ");
+  LLVM_DEBUG(dbgs() << "Clobbered Registers: ");
 
   const BitVector &UsedPhysRegsMask = MRI->getUsedPhysRegsMask();
   auto SetRegAsDefined = [&RegMask] (unsigned Reg) {
@@ -134,15 +134,15 @@
     }
   } else {
     ++NumCSROpt;
-    DEBUG(dbgs() << MF.getName()
-                 << " function optimized for not having CSR.\n");
+    LLVM_DEBUG(dbgs() << MF.getName()
+                      << " function optimized for not having CSR.\n");
   }
 
   for (unsigned PReg = 1, PRegE = TRI->getNumRegs(); PReg < PRegE; ++PReg)
     if (MachineOperand::clobbersPhysReg(&(RegMask[0]), PReg))
-      DEBUG(dbgs() << printReg(PReg, TRI) << " ");
+      LLVM_DEBUG(dbgs() << printReg(PReg, TRI) << " ");
 
-  DEBUG(dbgs() << " \n----------------------------------------\n");
+  LLVM_DEBUG(dbgs() << " \n----------------------------------------\n");
 
   PRUI->storeUpdateRegUsageInfo(&F, std::move(RegMask));