rustc_target: Add a compatibility layer to separate internal and user-facing linker flavors - #100552
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I want to do some refactorings in
rustc_target- mergelld_flavorandlinker_is_gnuintolinker_flavor, support combination gcc+lld (#96827).This PR adds some compatibility infra that makes that possible without making any changes to user-facing interfaces -
-Clinker-flavorvalues and json target specs. (For json target specs this infra may eventually go away since they are not very stable.)The second commit does some light refactoring of internal linker flavors (applies changes from petrochenkov@53eca42 that don't require mass-editing target specs).