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[LICM] NFC. Remove AST caching infrastructure

Authored by DaniilSuchkov on Jan 19 2020, 10:20 PM.

Description

[LICM] NFC. Remove AST caching infrastructure

Since LICM doesn't use AST caching any more (see D73081), this
infrastructure is now obsolete and we can remove it.

Reviewers: asbirlea, fhahn, efriedma, reames

Reviewed-By: asbirlea

Differential Revision: https://reviews.llvm.org/D73084