swift234

rework how implicitly "direct" property access is being computed in two ways:

- Set the direct bit on accesses to "Stored" properties, not just "stored
  with trivial accessors" ones.  This solves a ordering problem when analyzing
  uses of the property before it gets promoted to having trivial accessors.
- Chance our computation of "being directly defined on the type" to look through
  extension declcontexts, so we consider init methods in extensions to be
  directly defined on the type.

This is a prerequisite for other changes I'm working on, NFC from these alone.



Swift SVN r15949