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[DSE][NFC] Introduce "doesn't overwrite" return code for isOverwrite

Authored by Evgeniy Brevnov <ybrevnov@azul.com> on Nov 22 2021, 4:52 AM.

Description

[DSE][NFC] Introduce "doesn't overwrite" return code for isOverwrite

Add OR_None code to indicate that there is no overwrite. This has no any effect for current uses but will be used in one of the next patches building support for PHI translation.

Reviewed By: fhahn

Differential Revision: https://reviews.llvm.org/D105098