Change some CGF parameters to CGMs.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174939 91177308-0d34-0410-b5e6-96231b3b80d8
Call __cxa_begin_catch with the current exception before
calling std::terminate().  rdar://11904428

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174940 91177308-0d34-0410-b5e6-96231b3b80d8