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[Coroutines] Remove unused coroutine builtin/intrinsics llvm.coro.par…
…am (NFC-ish) I found that the coroutine intrinsic llvm.coro.param in documentation (https://llvm.org/docs/Coroutines.html#id101) didn't get used actually since there isn't lowering codes in LLVM. I also checked the implementation of libstdc++ and libc++. Both of them didn't use llvm.coro.param. So I am pretty sure that the llvm.coro.param intrinsic is unused. I think it would be better t to remove it to avoid possible misleading understandings. Note: according to [class.copy.elision]/p1.3, this optimization is allowed by the C++ language specification. Let's make it someday. Reviewed By: rjmccall Differential Revision: https://reviews.llvm.org/D115222
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