[pull] swiftwasm from apple:master#16
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`SymbolLookup.swift` was added recently, which broke our builds after rebasing on top of Apple's `master`. Using anything from this file wouldn't make sense on WebAssembly. It looks there are no codepaths that would call it on that platform, but there are still references to it around, so it has to be at least compilable.
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This is to workaround a bug in llvm's codegen when emitting the
callee-pop stack adjustment on a regular return from a swiftasync
function (vs. a tail call).
Without the workaround we fail to emit the callee-pop stack adjustment
leading to a mis-aligned stack on return.
```
pop {r7, pc}
add sp, #16
```
Workaround for rdar://79726989
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