Make MallocChecker debug output useful.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171439 91177308-0d34-0410-b5e6-96231b3b80d8
Fix capitalization of Objective-C in diagnostic.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171440 91177308-0d34-0410-b5e6-96231b3b80d8