[Reassociate] Preserve AAManager and BasicAA analyses.

Now Reassociate Pass invalidates the analysis results of AAManager and BasicAA,
but it saves GlobalsAA, although it seems that it should preserve them, since
it affects only Unary and Binary operators.

Author: kpolushin (Kirill)

Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D77137