Improve warnings on incompatible options involving -Zinstrument-coverage
Adds checks for: * `no_core` attribute * explicitly-enabled `legacy` symbol mangling * mir_opt_level > 1 (which enables inlining) I removed code from the `Inline` MIR pass that forcibly disabled inlining if `-Zinstrument-coverage` was set. The default `mir_opt_level` does not enable inlining anyway. But if the level is explicitly set and is greater than 1, I issue a warning. The new warnings show up in tests, which is much better for diagnosing potential option conflicts in these cases.
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