[pull] swiftwasm-release/5.4 from swift/release/5.4 #1012
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This extends any frame record created in the function to include that parameter, passed in X22. The new record looks like [X22, FP, LR] in memory, and FP is stored with 0b0001 stored in bits 63:60 (CodeGen assumes they are 0b0000 in normal operation). The effect of this is that tools walking the stack should expect to see one of three values there: * 0b0000 => a normal, non-extended record with just [FP, LR] * 0b0001 => the extended record [X22, FP, LR] * 0b1111 => kernel space, and a non-extended record. All other values are currently reserved. If compiling for arm64e this context pointer is address-discriminated with the discriminator 0xc31a and the DB (process-specific) key. There is also an "i8** @llvm.swift.async.context.addr()" intrinsic providing front-ends access to this slot (and forcing its creation initialized to nullptr if necessary).
This translates to "swiftasync" LLVM attribute.
…-pick Swift async frame cherry pick
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