[clang] Update uses of DEBUG macro to LLVM_DEBUG.

[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

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@332350 91177308-0d34-0410-b5e6-96231b3b80d8