Ben Langmuir d13b1c719f [cursor-info] Add a way to opt out of automatic request cancellation ...

The OncePerASTToken machinery lets us automatically cancel "stale"
requests after a new one comes in.  This avoid wasting time processing
requests that have been superceded, which is common for cursor-info, but
sometimes you really want to get results even later, so this commit adds
a way to opt out of the cancellation.

Incidentally, disable cancellation of name translation, which doesn't
really make sense and no one should be relying on that.

rdar://problem/31905379

2017-05-08 12:01:33 -07:00

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