Also, add a third [serializable] state for functions whose bodies we
*can* serialize, but only do so if they're referenced from another
serialized function.
This will be used for bodies synthesized for imported definitions,
such as init(rawValue:), etc, and various thunks, but for now this
change is NFC.
This handles cases where we pass a non-throwing closure to a function (e.g. a re-abstraction thunk) which accepts a throwing closure.
Fixes at least part of rdar://problem/30596064
Pass correct argument indices to the mangler for function specialization. This
has probably always been broken. The demangler doesn't support these manglings
anyway. It doesn't seem to have mattered in practice yet (aside from the
confusion of devs) like me. It will matter once we begin exposing public
specializations.
This consists of 3 parts:
1) Extend CallerAnalysis to also provide information if a function is partially applied
2) A new DeadArgSignatureOpt pass, similar to FunctionSignatureOpts, which just specializes for dead arguments of partially applied functions.
3) Let CapturePropagation eliminate such partial_apply instructions and replace them with a thin_to_thick conversion of the specialized functions.
This optimzation improves benchmarks where static struct or class functions are passed as a closure (e.g. -20% for SortStrings).
Such functions have a additional metatype parameter. We used to create a partial_apply in this case, which allocates a context, etc.
But this is not necessary as the metatype parameter is not used in most cases.
rdar://problem/27513085
Having a separate address and container value returned from alloc_stack is not really needed in SIL.
Even if they differ we have both addresses available during IRGen, because a dealloc_stack is always dominated by the corresponding alloc_stack in the same function.
Although this commit quite large, most changes are trivial. The largest non-trivial change is in IRGenSIL.
This commit is a NFC regarding the generated code. Even the generated SIL is the same (except removed #0, #1 and @local_storage).
