Rollup merge of #124748 - madsmtm:fix-32bit-watchos-unwind, r=Mark-Simulacrum

Fix unwinding on 32-bit watchOS ARM (v2)

This PR is identical to https://github.com/rust-lang/rust/pull/124494, which was approved and merged but then removed from master by a force-push due to a [CI bug](https://rust-lang.zulipchat.com/#narrow/stream/242791-t-infra/topic/ci.20broken.3F).

r? Mark-Simulacrum

Original PR description:

---

Found while doing https://github.com/rust-lang/rust/pull/124491, I wanted to unify the code under `target_vendor = "apple"`, and found that [Clang actually specifies that watchOS ARM 32-bit does not use SjLj](https://github.com/llvm/llvm-project/blob/llvmorg-18.1.4/clang/lib/Driver/ToolChains/Darwin.cpp#L3107-L3119).

I don't have an Apple Watch from that generation at hand to test this myself (series 1 to 3), and I don't think it will be sufficient to test it in the simulator (as it's architecture-specific), so maybe someone else could do so?

N.B. The code is written in a way to support 32-bit iOS and tvOS ARM devices (which do use SjLj) for future compatibility even though we currently only have a target for 32-bit iOS ARM (if you think that's excessive, then I'll change it).

`@rustbot` label O-watchos

0 files changed, 0 insertions, 0 deletions