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[Coverage] Support overriding compilation directory

Authored by phosek on Apr 9 2021, 11:53 AM.

Description

[Coverage] Support overriding compilation directory

When making compilation relocatable, for example in distributed
compilation scenarios, we want to set compilation dir to a relative
value like . but this presents a problem when generating reports
because if the file path is relative as well, for example .., you
may end up writing files outside of the output directory.

This change introduces a flag that allows overriding the compilation
directory that's stored inside the profile with a different value that
is absolute.

Differential Revision: https://reviews.llvm.org/D100232