Sync from rust 2025/08/03 #746
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The modules vec can already contain serialized modules and there is no need to distinguish between cached and non-cached cgus at LTO time.
And move exported_symbols_for_lto call from backends to cg_ssa.
Various refactors to the LTO handling code (part 2) Continuing from rust-lang/rust#143388 this removes a bit of dead code and moves the LTO symbol export calculation from individual backends to cg_ssa.
…nd the LLVM codegen backend.
Nobody seems to actually use this, while still adding some extra complexity to the already rather complex codegen coordinator code. It is also not supported by any backend other than the LLVM backend.
…test-allow-stage0`
Implement support for `become` and explicit tail call codegen for the LLVM backend This PR implements codegen of explicit tail calls via `become` in `rustc_codegen_ssa` and support within the LLVM backend. Completes a task on (rust-lang/rust#112788). This PR implements all the necessary bits to make explicit tail calls usable, other backends have received stubs for now and will ICE if you use `become` on them. I suspect there is some bikeshedding to be done on how we should go about implementing this for other backends, but it should be relatively straightforward for GCC after this is merged. During development I also put together a POC bytecode VM based on tail call dispatch to test these changes out and analyze the codegen to make sure it generates expected assembly. That is available [here](https://github.com/xacrimon/tcvm).
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