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Auto merge of #59343 - eddyb:rm-def-symbol-name, r=<try>
rustc(codegen): uncache `def_symbol_name` prefix from `symbol_name`. The `def_symbol_name` query was an optimization to avoid recomputing the common part of a symbol name, as only the hash needs to be added to it for each symbol. However, #57967 will add a new mangling scheme, which doesn't readily support this kind of reuse - while it's plausible, it requires a lot more effort, since you'd have to "symbolically evaluate" mangling, and keep it in a form where the backreference positions can be computed correctly in the final step. So I want to see how much time we're actually saving with this `def_symbol_name` optimization, nowadays.
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