[PATCH] D65619: [lit] use built-in clear_environment instead of external env command

[Joel E. Denny via Phabricator via llvm-commits]

jdenny added a comment.

In D65619#1611360 <https://reviews.llvm.org/D65619#1611360>, @inglorion wrote:

> Heh, I just missed the revert. @jdenny, feel free to use this as inspiration.


Thanks.  :-)

I believe that also clears those variables for the outer lit running lit's test suite.  I only wanted to clear them for the `%{lit}` calls within lit's test suite.


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https://reviews.llvm.org/D65619