Rollup merge of #71747 - spastorino:safety-scheme-around-consts-cleanup, r=oli-obk
Rollup merge of #71747 - spastorino:safety-scheme-around-consts-cleanup, r=oli-obk

Remove deadcode in eval_mir_constant_to_operand

r? @oli-obk @RalfJung

graydon/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust