Add inline hints to some small functions

[ ] This has been discussed in issue #..., or if not, please tell us why here.
[ ] A short description of what this does, why it is needed; if the description becomes long, the matter should probably be discussed in an issue first. Before this PR, several short functions were not getting inlined into another crate, as they are neither generic, nor marked with an inline hint.
[ ] This PR contains test cases, if meaningful. N/A
[ ] A reviewer from the core maintainer team has been assigned for this PR. If you don't know who could review this, please indicate so and/or ping bnjbvr. The list of suggested reviewers on the right can help you.

Keeping this as draft until I have identified more functions that could benefit from this.

bytecodealliance / cranelift