Allows customization of builtin functions under FatLTO#119348

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dianqk wants to merge 4 commits intorust-lang:masterfrom

dianqk:lto-custom-builtins

Commits on Dec 27, 2023

Commits on Dec 30, 2023

Allows customization of builtin functions under FatLTO
dianqk
committed

Commits on Dec 31, 2023

Avoid recalculating `UserBuiltinsSymbols`
dianqk
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