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Re-land "Use -fdebug-compilation-dir to form absolute paths in coverage…

Authored by rnk on Oct 10 2019, 11:01 AM.

Description

Re-land "Use -fdebug-compilation-dir to form absolute paths in coverage mappings"

This reverts r374324 (git commit 62808631acceaa8b78f8ab9b407eb6b943ff5f77)

I changed the test to not rely on finding the sequence "clang, test,
CoverageMapping" in the CWD used to run the test. Instead it makes its
own internal directory hierarchy of foo/bar/baz and looks for that.

llvm-svn: 374403