Handle rustc_query_impl cases of rustc::potential_query_instability lint
          #131192
        
          
      
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This PR removes
#![allow(rustc::potential_query_instability)]line fromcompiler/rustc_query_impl/src/lib.rsand converts(was not necessary for this PR).FxHash{Map,Set}types intoFxIndex{Map,Set}to suppress lint errorsA somewhat tracking issue: #84447
r? @compiler-errors