cranelift: Specialize uses of StackAMode::SPOffset #8297
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When this variant is used within a specific target backend, we know exactly which address-mode to generate, so using the target independent `StackAMode` doesn't buy us anything. This PR ensures that `StackAMode` is only constructed by target independent code in machinst::abi, so that it's easier to figure out how each of the variants are used.
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When this variant is used within a specific target backend, we know exactly which address-mode to generate, so using the target independent
StackAModedoesn't buy us anything.This PR ensures that
StackAModeis only constructed by target independent code in machinst::abi, so that it's easier to figure out how each of the variants are used.