Various minor target feature cleanups around backchain, crt-static, reserve-x18 #142500
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This does change the logic a bit: previously, we didn't forward reverse implications of negated features to the backend, instead relying on the backend to handle the implication itself.
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Based on top of #140920, only the last commit is new.
cfg(target_feature = "backchain")(s390x target feature) be enabled? #142412.-Ctarget-featurethat only care about actual target features (and not "crt-static") have it. Previously, we actually setcfg(target_feature = "crt-static")twice: once in the backend target feature logic, and once specifically for that one feature. IIUC, some targets are meant to ignore-Ctarget-feature=+crt-static, it seems like before this PR that flag still incorrectly enabledcfg(target_feature = "crt-static")(but I didn't test this).-Zflag.