IRGen: Fix out-of-order task_dealloc with parameter pack metadata #81516
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We deallocate an instruction's packs at points where no further control flow path uses the value. In the case of an alloc_stack, this will be right after the dealloc_stack. Thus, if alloc_stack allocates some packs to build type metadata for a tuple type that contains a pack, and then proceeds to allocate a value large enough to hold the tuple, we will free the second allocation first, before we free the pack, as expected. However, after stack allocating the value, alloc_stack does some further work to emit debug info. This could result in emission of additional metadata packs. Split up the debug info emission into two parts; the first we do before we perform the stack allocation, the rest we do after. - Fixes swiftlang#67702. - Fixes rdar://problem/141363236.
A pack archetype from an outer expansion here is treated as a scalar.
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We deallocate an instruction's packs at points where no further control flow path uses the value. In the case of an
alloc_stack, this will be right after thedealloc_stack. Thus, ifalloc_stackallocates some packs to build type metadata for a tuple type that contains a pack, and then proceeds to allocate a value large enough to hold the tuple, we will free the second allocation first, before we free the pack, as expected.However, after stack allocating the value,
alloc_stackdoes some further work to emit debug info. This could result inemission of additional metadata packs.
Split up the debug info emission into two parts; the first we do before we perform the stack allocation, the rest we do after.