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/IR/Core.cpp b/llvm/lib/IR/Core.cpp
index 02311db..5f13f23 100644
--- a/llvm/lib/IR/Core.cpp
+++ b/llvm/lib/IR/Core.cpp
@@ -1669,8 +1669,9 @@
     GV->setLinkage(GlobalValue::LinkOnceODRLinkage);
     break;
   case LLVMLinkOnceODRAutoHideLinkage:
-    DEBUG(errs() << "LLVMSetLinkage(): LLVMLinkOnceODRAutoHideLinkage is no "
-                    "longer supported.");
+    LLVM_DEBUG(
+        errs() << "LLVMSetLinkage(): LLVMLinkOnceODRAutoHideLinkage is no "
+                  "longer supported.");
     break;
   case LLVMWeakAnyLinkage:
     GV->setLinkage(GlobalValue::WeakAnyLinkage);
@@ -1694,19 +1695,21 @@
     GV->setLinkage(GlobalValue::PrivateLinkage);
     break;
   case LLVMDLLImportLinkage:
-    DEBUG(errs()
-          << "LLVMSetLinkage(): LLVMDLLImportLinkage is no longer supported.");
+    LLVM_DEBUG(
+        errs()
+        << "LLVMSetLinkage(): LLVMDLLImportLinkage is no longer supported.");
     break;
   case LLVMDLLExportLinkage:
-    DEBUG(errs()
-          << "LLVMSetLinkage(): LLVMDLLExportLinkage is no longer supported.");
+    LLVM_DEBUG(
+        errs()
+        << "LLVMSetLinkage(): LLVMDLLExportLinkage is no longer supported.");
     break;
   case LLVMExternalWeakLinkage:
     GV->setLinkage(GlobalValue::ExternalWeakLinkage);
     break;
   case LLVMGhostLinkage:
-    DEBUG(errs()
-          << "LLVMSetLinkage(): LLVMGhostLinkage is no longer supported.");
+    LLVM_DEBUG(
+        errs() << "LLVMSetLinkage(): LLVMGhostLinkage is no longer supported.");
     break;
   case LLVMCommonLinkage:
     GV->setLinkage(GlobalValue::CommonLinkage);