It's likely that these were listed as "REQUIRES: OS=macosx" to not
redundantly run them for iOS et al, but they don't take that long and
so it's more useful for Linux devs to be able to run them locally if
need be. Or to catch something that really is different on non-macOS.
This improves on the previous situation:
- The request ensures that the backing storage for lazy properties
and property wrappers gets synthesized first; previously it was
only somewhat guaranteed by callers.
- Instead of returning a range this just returns an ArrayRef,
which simplifies clients.
- Indexing into the ArrayRef is O(1), which addresses some FIXMEs
in the SIL optimizer.
Adds a NumStoredPropertiesQueries stat.
Adds a test case for an increasing number of lazy stored class
properties. Each property requires a formal access within the
initializer. This would manifest as cubic behavior in
AccessEnforcementOpts, which scales as O(1.5) in the above stat.
