[MemDep] Also remove load instructions from NonLocalDesCache.
Currently load instructions are added to the cache for invariant pointer group dependencies, but only pointer values are removed currently. That leads to dangling AssertingVHs in the test case below, where we delete a load from an invariant pointer group. We should also remove the entries from the cache. Fixes PR46054. Reviewers: efriedma, hfinkel, asbirlea Reviewed By: efriedma Differential Revision: https://reviews.llvm.org/D81726
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