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/RegUsageInfoPropagate.cpp b/llvm/lib/CodeGen/RegUsageInfoPropagate.cpp
index 5b12d00..7eaeea2 100644
--- a/llvm/lib/CodeGen/RegUsageInfoPropagate.cpp
+++ b/llvm/lib/CodeGen/RegUsageInfoPropagate.cpp
@@ -105,9 +105,9 @@
   const Module *M = MF.getFunction().getParent();
   PhysicalRegisterUsageInfo *PRUI = &getAnalysis<PhysicalRegisterUsageInfo>();
 
-  DEBUG(dbgs() << " ++++++++++++++++++++ " << getPassName()
-               << " ++++++++++++++++++++  \n");
-  DEBUG(dbgs() << "MachineFunction : " << MF.getName() << "\n");
+  LLVM_DEBUG(dbgs() << " ++++++++++++++++++++ " << getPassName()
+                    << " ++++++++++++++++++++  \n");
+  LLVM_DEBUG(dbgs() << "MachineFunction : " << MF.getName() << "\n");
 
   const MachineFrameInfo &MFI = MF.getFrameInfo();
   if (!MFI.hasCalls() && !MFI.hasTailCall())
@@ -119,9 +119,10 @@
     for (MachineInstr &MI : MBB) {
       if (!MI.isCall())
         continue;
-      DEBUG(dbgs()
-            << "Call Instruction Before Register Usage Info Propagation : \n");
-      DEBUG(dbgs() << MI << "\n");
+      LLVM_DEBUG(
+          dbgs()
+          << "Call Instruction Before Register Usage Info Propagation : \n");
+      LLVM_DEBUG(dbgs() << MI << "\n");
 
       auto UpdateRegMask = [&](const Function *F) {
         const auto *RegMask = PRUI->getRegUsageInfo(F);
@@ -134,15 +135,17 @@
       if (const Function *F = findCalledFunction(*M, MI)) {
         UpdateRegMask(F);
       } else {
-        DEBUG(dbgs() << "Failed to find call target function\n");
+        LLVM_DEBUG(dbgs() << "Failed to find call target function\n");
       }
 
-      DEBUG(dbgs() << "Call Instruction After Register Usage Info Propagation : "
-            << MI << '\n');
+      LLVM_DEBUG(
+          dbgs() << "Call Instruction After Register Usage Info Propagation : "
+                 << MI << '\n');
     }
   }
 
-  DEBUG(dbgs() << " +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++"
-                  "++++++ \n");
+  LLVM_DEBUG(
+      dbgs() << " +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++"
+                "++++++ \n");
   return Changed;
 }