Fix mismatched #endif.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172860 91177308-0d34-0410-b5e6-96231b3b80d8
Adopt llvm::hexDigitValue.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172861 91177308-0d34-0410-b5e6-96231b3b80d8
Remove unused variable

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172862 91177308-0d34-0410-b5e6-96231b3b80d8