Andrew Trick 958dd9701d Prevent FunctionSignatureOptimization from rerunning on its own thunk. ...

This is a bug fix that just bails out of FSO, which is exactly what we
should be doing in this case anyway.

This issue will be exposed in stdlib builds once I fix another bug in
the passmanager. Once the pass pipeline restart works as intended, we
will perform FSO on `F`, then devirtualization will discover a new
reference to `F`, causing it to be pushed back on the function pass
pipeline.

2019-02-06 13:32:27 -08:00

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