Introduce sync reason JoinCall
& Limit sync
at function start nodes
#1508
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Helps avoid "sync" calls for function start nodes when threadflag is context-sensitive. Previously, it was only avoided when the flag was path-sensitive (c.f. #1475).
This has some immediate termination advantages, and can potentially also boost precision.
TODO:
threadflag
is path-sensitive but not context-sensitive? (It seems sound, but this notion may require re-thinking in general Reconsider notion of path-sensitive but context-insensitive analysis #1509 )Closes #1507