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Support swifttailcc on WebAssembly #69333

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@kateinoigakukun

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@kateinoigakukun

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Currently LLVM WebAssembly backend does not support swifttailcc now. To unlock deep coroutine-split function calls, it would be best to have the support

See #69061 (comment)

rdar://116753879

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IRGenLLVM IR generationWebAssemblyPlatform: WebAssemblybugA deviation from expected or documented behavior. Also: expected but undesirable behavior.

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