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Without this patch, when using lit's internal shell, if `env` on a lit
RUN line calls `env`, lit accidentally searches for the latter as an
external executable. What's worse is that works fine when a developer
is testing on a platform where `env` is available and behaves as
expected, but it then breaks on other platforms.
`env` calling `env` can make sense if one such `env` is within a lit
substitution, as in D65156 and D65121. This patch ensures that lit
executes both as internal commands.
Reviewed By: probinson, mgorny, rnk
Differential Revision: https://reviews.llvm.org/D65697
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