swift234

AST: Split up RecursiveTypePropeties::isMaterializable() into sub-cases and fix a bug

We already had isLValue(), which implied !isMaterializable().
Now, add separate flags for hasInOut() and hasDefaultArg().
The old isMaterializable() predicate is still provided,
by testing for all three flags.

The new predicates are not used for now, but will be soon
as part of reabstraction thunk changes required for resilience.

Also two fixes:

1) Before this change RecursiveTypeProperties was incorrectly
sized at 8 bits when it actually needs 9. This fixes a regression
from SVN r31130, "Introduce a new UnresolvedType to the type system".

2) DynamicSelf::get() would clear out non-materializability
but not lvalue-ness of its base type, which looks like an old
copy/paste and not intentional. Stick an assert there instead.