Remove unnecessary IsFirst variable from debug codde in GetDiagInfo.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@186649 91177308-0d34-0410-b5e6-96231b3b80d8
Remove trailing whitespace.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@186652 91177308-0d34-0410-b5e6-96231b3b80d8