Add bitcast to store of personality function.

The personality function is user defined and may have an arbitrary result type.
The code assumes always i8*. This results in an assertion failure if a different
type is used. A bitcast to i8* is added to prevent this failure.

Reviewed by: Renato Golin, Bob Wilson

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181802 91177308-0d34-0410-b5e6-96231b3b80d8