* Fix unnecessary one-time recompile of stdlib with -enable-ossa-flag
This includes a bit in the module format to represent if the module was
compiled with -enable-ossa-modules flag. When compiling a client module
with -enable-ossa-modules flag, all dependent modules are checked for this bit,
if not on, recompilation is triggered with -enable-ossa-modules.
* Updated tests
Having purpose attached to the contextual type element makes it much
easier to diagnose contextual mismatches without involving constraint
system state.
This saves us from needing to re-match args to params in CSApply and is also
useful for a forthcoming change migrating code completion in argument position
to use the solver-based typeCheckForCodeCompletion api.
rdar://76581093
Nothing besides static member refs on protocols feature is currently
using transitive protocols, so instead of trying to infer them on every
step let's do that only for base type of a dot-syntax reference when
there are no other bindings for it.
Currently inference logic only checked direct equivalence class members
associated with a "work-in-progress" type variable, but each member can
have local equivalences as well that need to be accounted for.
Resolves: rdar://75978086
`PotentialBindings` lost most of its responsibilities,
and are no longer comparable. Their main purpose now
is binding and metadata tracking (introduction/retraction).
New `BindingSet` type is something that represents a set
of bindings at the current step of the solver.
This patch fixes the unsigned/signed comparison warnings in the
unittests caused by comparing an unsigned integer with the signed
integer literal. The offending signed integer literals have been
replaced with unsigned integer literals.
