IRgen: Fix another case where we generated an invalid access component when we
immediately narrowed the access size. Fix this (and previous case) by just
choosing a better access size up-front.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@102068 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed