Fix a case where we were incorrectly sign-extending a value when we should have been zero-extending the value.
Also change some SIGN_EXTEND to ANY_EXTEND because we really dont care and may have more opportunity to fold subexpressions
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185331 91177308-0d34-0410-b5e6-96231b3b80d8
