Don't add a fragment expression when GlobalSRA splits up a single-member struct

Fixes PR34390.

https://bugs.llvm.org/show_bug.cgi?id=34390

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@312196 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed