configure: Document CLANG, LLC, and OPT variables

Authored by bgamari on Feb 9 2019, 4:34 PM.

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configure: Document CLANG, LLC, and OPT variables

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Committed
Marge Bot <ben+marge-bot@smart-cactus.org>Feb 12 2019, 6:54 PM
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rGHCa08f463bcc97: Fix #15849 by checking whether there's a do block
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Marge Bot <ben+marge-bot@smart-cactus.org> committed rGHC28683137a596: configure: Document CLANG, LLC, and OPT variables (authored by bgamari).Feb 12 2019, 6:54 PM