Ross Bayer a43604498b [build-script] Respect TOOLCHAINS environment variable (#14202) ...

* Respect the TOOLCHAINS environment variable if set when deciding the darwin xcrun toolchain.

* Updated test/lit.cfg to respect the TOOLCHAINS environment variable when deciding the xcrun toolchain for Darwin platforms, rather than hardcoding the default.

* Fixed the default darwin xcrun toolchain logic.

2018-01-30 13:20:55 -08:00

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