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/IPO/BlockExtractor.cpp b/llvm/lib/Transforms/IPO/BlockExtractor.cpp
index 9d30efd..ff5ee81 100644
--- a/llvm/lib/Transforms/IPO/BlockExtractor.cpp
+++ b/llvm/lib/Transforms/IPO/BlockExtractor.cpp
@@ -147,8 +147,9 @@
     // Check if the module contains BB.
     if (BB->getParent()->getParent() != &M)
       report_fatal_error("Invalid basic block");
-    DEBUG(dbgs() << "BlockExtractor: Extracting " << BB->getParent()->getName()
-                 << ":" << BB->getName() << "\n");
+    LLVM_DEBUG(dbgs() << "BlockExtractor: Extracting "
+                      << BB->getParent()->getName() << ":" << BB->getName()
+                      << "\n");
     SmallVector<BasicBlock *, 2> BlocksToExtractVec;
     BlocksToExtractVec.push_back(BB);
     if (const InvokeInst *II = dyn_cast<InvokeInst>(BB->getTerminator()))
@@ -161,8 +162,8 @@
   // Erase the functions.
   if (EraseFunctions || BlockExtractorEraseFuncs) {
     for (Function *F : Functions) {
-      DEBUG(dbgs() << "BlockExtractor: Trying to delete " << F->getName()
-                   << "\n");
+      LLVM_DEBUG(dbgs() << "BlockExtractor: Trying to delete " << F->getName()
+                        << "\n");
       F->deleteBody();
     }
     // Set linkage as ExternalLinkage to avoid erasing unreachable functions.