[clang] Update uses of 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

Explicitly avoided changing the strings in the clang-format tests.

Differential Revision: https://reviews.llvm.org/D44975

llvm-svn: 332350
diff --git a/clang/unittests/Format/NamespaceEndCommentsFixerTest.cpp b/clang/unittests/Format/NamespaceEndCommentsFixerTest.cpp
index fda8b4d..ee083b8 100644
--- a/clang/unittests/Format/NamespaceEndCommentsFixerTest.cpp
+++ b/clang/unittests/Format/NamespaceEndCommentsFixerTest.cpp
@@ -25,13 +25,13 @@
   fixNamespaceEndComments(llvm::StringRef Code,
                           const std::vector<tooling::Range> &Ranges,
                           const FormatStyle &Style = getLLVMStyle()) {
-    DEBUG(llvm::errs() << "---\n");
-    DEBUG(llvm::errs() << Code << "\n\n");
+    LLVM_DEBUG(llvm::errs() << "---\n");
+    LLVM_DEBUG(llvm::errs() << Code << "\n\n");
     tooling::Replacements Replaces =
         clang::format::fixNamespaceEndComments(Style, Code, Ranges, "<stdin>");
     auto Result = applyAllReplacements(Code, Replaces);
     EXPECT_TRUE(static_cast<bool>(Result));
-    DEBUG(llvm::errs() << "\n" << *Result << "\n\n");
+    LLVM_DEBUG(llvm::errs() << "\n" << *Result << "\n\n");
     return *Result;
   }