Refine report_fatal_error guidance after post-commit review

Description

Refine report_fatal_error guidance after post-commit review

Use text suggested by Justin Bogner in post-commit review of r311146
http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20170814/479898.html,
which makes it clear that report_fatal_error shouldn't be used when there is a
practicable alternative. Also make this clearer in CodingStandards.

Details

Committed
asbAug 17 2017, 11:45 PM
Parents
rL311146: Give guidance on report_fatal_error in CodingStandards.rst and…
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