Fix a crash with -Wassign-enum, where we didn't adjust the APInt type of the
constant. Also fix some spelling mistakes and formatting issues.

Reviewed by Richard Smith over IRC.

Fixes PR15069.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@183409 91177308-0d34-0410-b5e6-96231b3b80d8