clang: Hack around opencl enqueue_block using wrong ABI for aggregrate (#130011) EmitAggExprToLValue started wrapping the temporary alloca in an addrspacecast at some point. We take the direct type from this as the pointer argument for the runtime function type, but this isn't correct. Technically, we should be querying the target's ABI for what IR to produce for this sequence. The assumption seems to always have been that this will be indirectly passed with byval (or byref). I started working on a patch to go through the ABI handling, but it seems to require more time and/or clang expertise than I have at the moment.
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