Sync from rust 2025/08/03#746

Merged

antoyo merged 16 commits intomasterfrom

sync_from_rust_2025_08_03

Aug 4, 2025

Commits on Jul 22, 2025

Rename `tests/assembly` into `tests/assembly-llvm`
GuillaumeGomez
committed

Commits on Jul 24, 2025

Auto merge of #144062 - bjorn3:lto_refactors2, r=davidtwco
bors
committed

Commits on Jul 25, 2025

Implement support for explicit tail calls in the MIR block builders and the LLVM codegen backend.
xacrimon
committed

Commits on Jul 26, 2025

Remove support for -Zcombine-cgu
bjorn3
committed

Commits on Jul 30, 2025

Update `codegen_{cranelift,gcc}` and `opt-dist` to use `build.compiletest-allow-stage0`
jieyouxu
committed

Commits on Jul 31, 2025