Cranelift: tweak the ISLE-source-dir build script functionality. (#10466)

- Add a `cargo:rerun-if-env-changed` clause for the `ISLE_SOURCE_DIR`
environment variable to properly rebuild if the conf

Cranelift: tweak the ISLE-source-dir build script functionality. (#10466)

- Add a `cargo:rerun-if-env-changed` clause for the `ISLE_SOURCE_DIR`
environment variable to properly rebuild if the config changes.
- Update docs to point to the new env-var-based approach rather than the
old Cargo feature.

As per this Zulip conversation [1] and this GitHub comment [2].

[1]: https://bytecodealliance.zulipchat.com/#narrow/channel/217117-cranelift/topic/How.20to.20enable.20the.20isle-in-source-tree.20feature.3F/near/508028830
[2]: https://github.com/bytecodealliance/wasmtime/pull/9633#discussion_r2012230673

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Update ir.md (#10319)

Hello,

A possible typo in this text:

"Forward" Should be "Foreword"

"Forward" means to move ahead, but the correct term for an introduction is "Foreword".

Thanks.

IR documentation improvements and improve debug assert (#10130)

* Cranelift/x64 backend: improve pointer width assert. (#10118)

This adds additional information as to what is wrong when this assert

IR documentation improvements and improve debug assert (#10130)

* Cranelift/x64 backend: improve pointer width assert. (#10118)

This adds additional information as to what is wrong when this assert is encountered.

* Cranelift/docs: Change pointer width in ir docs to 64 bits (#10118)

Most people using this example will likely be on 64 bit systems, so it makes
sense to target a system with 64 bit addressses with the example.

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