NFC. Remove obsolete SimpleAnalysis infrastructure

Apparently cache of AliasSetTrackers held by LICM was the only user of
SimpleAnalysis infrastructure. Now, given that we no longer have that
cache, this infrastructure is obsolete and, taking into account its
nature, we don't want any new solutions to be based on it.

Reviewers: asbirlea, fhahn, efriedma, reames

Reviewed-By: asbirlea

Differential Revision: https://reviews.llvm.org/D73085