[clang-tools-extra] 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

Differential Revision: https://reviews.llvm.org/D44976

llvm-svn: 332371
diff --git a/clang-tools-extra/clang-tidy/ClangTidyOptions.cpp b/clang-tools-extra/clang-tidy/ClangTidyOptions.cpp
index 75e3b37..430f8b3 100644
--- a/clang-tools-extra/clang-tidy/ClangTidyOptions.cpp
+++ b/clang-tools-extra/clang-tidy/ClangTidyOptions.cpp
@@ -225,7 +225,8 @@
 // similar.
 std::vector<OptionsSource>
 FileOptionsProvider::getRawOptions(StringRef FileName) {
-  DEBUG(llvm::dbgs() << "Getting options for file " << FileName << "...\n");
+  LLVM_DEBUG(llvm::dbgs() << "Getting options for file " << FileName
+                          << "...\n");
   assert(FS && "FS must be set.");
 
   llvm::SmallString<128> AbsoluteFilePath(FileName);
@@ -254,8 +255,8 @@
     if (Result) {
       // Store cached value for all intermediate directories.
       while (Path != CurrentPath) {
-        DEBUG(llvm::dbgs() << "Caching configuration for path " << Path
-                           << ".\n");
+        LLVM_DEBUG(llvm::dbgs()
+                   << "Caching configuration for path " << Path << ".\n");
         CachedOptions[Path] = *Result;
         Path = llvm::sys::path::parent_path(Path);
       }
@@ -282,7 +283,7 @@
   for (const ConfigFileHandler &ConfigHandler : ConfigHandlers) {
     SmallString<128> ConfigFile(Directory);
     llvm::sys::path::append(ConfigFile, ConfigHandler.first);
-    DEBUG(llvm::dbgs() << "Trying " << ConfigFile << "...\n");
+    LLVM_DEBUG(llvm::dbgs() << "Trying " << ConfigFile << "...\n");
 
     bool IsFile = false;
     // Ignore errors from is_regular_file: we only need to know if we can read