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[NFC][AA] Prepare to convert AliasResult to class with PartialAlias offset.

Authored by dfukalov on Mar 5 2021, 2:58 AM.

Description

[NFC][AA] Prepare to convert AliasResult to class with PartialAlias offset.

Main reason is preparation to transform AliasResult to class that contains
offset for PartialAlias case.

Reviewed By: asbirlea

Differential Revision: https://reviews.llvm.org/D98027