Convert SemaInit.cpp to pass a callback object to CorrectTypo.

And once again improve the typo correction results in certain
situations just by moving the existing checks on the correction.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@148037 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed