[IR] Fix creating mutable versions of TBAA access tags

Due to a typo in D41565, mutable TBAA tags created with
createMutableTBAAAccessTag() lose their base types. This patch
fixes that typo and updates tests respectively.

Differential Revision: https://reviews.llvm.org/D42364


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@325008 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed