[WIP] rustc_span: Symbol perf experiments - #80420

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Commits on Jan 1, 2021

rustc_span: Symbol perf experiments
petrochenkov
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5b94342
Slow down `Symbol::as_str`
petrochenkov
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5d192a4
Revert "Slow down `Symbol::as_str`"
petrochenkov
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f7eabf5
Double the number of static symbols
petrochenkov
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bbaac07
Double the number of static symbols again
petrochenkov
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351843f
Compare string search performance of `phf::Map` and `FxHashMap`
petrochenkov
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616633f
Avoid double hashing by using raw entry APIs
petrochenkov
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8809118