Update to nightly-2025-08-11.

[nnethercote]

• CoverageInfoBuilderMethods::init_coverage was removed.
• The ret_ptr argument was added to BuilderMethods::atomic_rmw, see atomicrmw on pointers: move integer-pointer cast hacks into backend rust-lang/rust#144192.

[nnethercote]

This doesn't work because rust-lang/rust#144192 changed the signature of atomic_rmw and I don't know how to update it appropriately. As written the code fails with an assertion. @FractalFir, it looks like you wrote the atomics code, do you know what to do here? The GCC and LLVM backends look a bit different to the CUDA backend so I can't just copy what they are doing.

[nnethercote]

Thanks for the help! I will try to translate your words into the relevant code.

[nnethercote]

I have made some progress. I have plausible code for atomic_load/atomic_store and semi-plausible code for atomic_rmw. cargo compiletest succeeds. And cargo build succeeds if I exclude a couple more examples (vecadd, gemm, sha2_crates_io). If I don't exclude those, I get this assertion failure:

 thread 'rustc' (6519) panicked at /github/home/.rustup/toolchains/nightly-2025-08-11-x86_64-unknown-linux-gnu/lib/rustlib/rustc-src/rust/compiler/rustc_codegen_ssa/src/mir/operand.rs:349:25: assertion `left == right` failed left: Size(16 bytes) right: Size(8 bytes) 

I'm not even sure if this is related to the atomic_rmw change.

[nnethercote]

The assertion failure is unrelated to the atomic_rmw change. It's caused by something in nightly-2025-08-09. That nightly has the commit range 2fd855fbf..de3efa79f. I suspect the problem is rust-lang/rust#144764.