Prereq6 for async drop - templated coroutine processing and layout #129741
+1,047
−1,943
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This is subpart 6 PR of #123948, just for review purposes.
For
async_drop_in_place<T>(dropee)::{{closure0}}
we need to perform shim codegen already with dropee type substituted.To generate async drop glue we are generating sync-like drop glue using drop elaboration and then applying StateTransform pass to convert it into coroutine poll function. This coroutine has completely different layout dependent of dropee T, so it cannot be represented by generic coroutine with later T substitution (after codegen).
AsyncDropInPlacePoll
lang item coroutine is considered as templated and will be codegen'ed already with GenericArgs substituted.Review only last commit, based on previous PR #129740