Jordan Rose 7f1314f8d8 lit.py: Add new %{shared_output(LABEL)} substitution
This refers to a temporary path that can be shared across all tests,
identified by a particular label. This can be used for things like
caches.

At the moment, the character set for the LABEL is limited to C
identifier characters, plus '-', '+', '=', and '.'. This is the same
set of characters currently allowed in REQUIRES clause identifiers.

llvm-svn: 315697
2017-10-13 16:12:23 +00:00
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