Rustup #4157
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Rustup #4157
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Get rid of `mir::Const::from_ty_const` This function is strange, because it turns valtrees into `mir::Const::Value`, but the rest of the const variants stay as type system consts. All of the callsites except for one in `instsimplify` (array length simplification of `ptr_metadata` call) just go through the valtree arm of the function, so it's easier to just create a `mir::Const` directly for those. For the instsimplify case, if we have a type system const we should *keep* having a type system const, rather than turning it into a `mir::Const::Value`; it doesn't really matter in practice, though, bc `usize` has no padding, but it feels more principled.
Fix tests on LLVM 20 For sparcv8plus.rs, duplicate the test for LLVM 19 and LLVM 20. LLVM 20 resolves one of the FIXME in the test. For x86_64-bigint-add.rs split the check lines for LLVM 19 and LLVM 20. The difference in codegen here is due to a difference in unroll factor, which I believe is not what the test is interested in. Fixes rust-lang/rust#132957. Fixes rust-lang/rust#133754.
Update rustc_codegen_gcc subtree cc `@antoyo`
Miri subtree update r? `@ghost`
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With rust-lang/rust#136086 closed, we shouldn't have to allow linker-messages any more.