This is a large patch; I couldn't split it up further while still
keeping things working. There are four things being changed at
once here:
- Places that call SILType::isAddressOnly()/isLoadable() now call
the SILFunction overload and not the SILModule one.
- SILFunction's overloads of getTypeLowering() and getLoweredType()
now pass the function's resilience expansion down, instead of
hardcoding ResilienceExpansion::Minimal.
- Various other places with '// FIXME: Expansion' now use a better
resilience expansion.
- A few tests were updated to reflect SILGen's improved code
generation, and some new tests are added to cover more code paths
that previously were uncovered and only manifested themselves as
standard library build failures while I was working on this change.
32-bit iOS Simulator tests are compiled with an iOS 7 depolyment target, so the “always available” case wasn’t available there, causing a spurious test failure.
Moves a lot of it into helper functions and types so it doesn’t disrupt the main flow of the code so much. Also makes it handle always-unavailable and obsolete cases (by skipping them).
When a case has an @available(currentPlatform, introduced: x.y) attribute, the auto-derived init(rawValue:) will now include a “guard #available(currentPlatform x.y, *) else { return nil }” check to prevent the new case from being returned.
This requires a targeted hack to disable @available(introduced:) checks in auto-derived init(rawValue:) implementations; the availability checker is SourceLoc-based, so it can’t tell that the synthesized `guard` covers the use of the case. I’m not happy about that, but fixing the deeper problem is a much larger task than I can take on in one day.
