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parameterized on target details to decide value-extension policy on calls, in order to address how Apple's aarch64 ABI differs from that on Linux and Windows. Updated to incorporate review feedback: adjust comment on new enum specifying param extension policy. Updated to incorporate review feedback: shorten enum names and those of its variants to make it less unwieldy. placate tidy.
rustc_target contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc dev guide.