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[CMake] Enable the use of -ffile-prefix-map

Authored by phosek on Mar 11 2020, 10:59 AM.

Description

[CMake] Enable the use of -ffile-prefix-map

This handles not paths embedded in debug info, but also in sources.
Since the use of this flag is controlled by an option, rather than
replacing the new option, we add a new option.

Differential Revision: https://reviews.llvm.org/D76018