Erik Eckstein 5c17f0f6f8 SILCombine: peephole to propagate resilient enum cases ...

Basically the pattern to optimize is:
    inject_enum_addr %stackloc, #SomeCase
    switch_enum_addr %stackloc ...

This works even if the enum is resilient and the case does not have a payload. As long as we don't have opaque values in SIL we need this peephole to optimize the pattern.
This change fixes the code generation for Float.rounded().

rdar://problem/46353885

2018-12-10 16:14:15 -08:00

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