Use dynamic dispatch in `mozjs::panic::wrap_panic`

[SimonSapin]

Pick up servo/rust-mozjs#512

Fixes #26585

This diff is best viewed with "ignore whitespace changes", because of indentation change.

[highfive]

Heads up! This PR modifies the following files:

• @asajeffrey: components/script/dom/bindings/codegen/CodegenRust.py, components/script/script_runtime.rs
• @KiChjang: components/script/dom/bindings/codegen/CodegenRust.py, components/script/script_runtime.rs

[highfive]

Warning

• These commits modify script code, but no tests are modified. Please consider adding a test!

[Manishearth]

seems good, r=me pending jdm's perf investigation

we could also potentially make it a cfg to use dynamic dispatch here, if there is a small but nontrivial perf impact

[jdm]

I've verified that performance stays the same on the majority of the demos at https://servo.org/hl-home/. We may be slightly slower at flinging balls as fast as possible in ballshooter, and the particles might also be slightly slower, but both of those were also within the realm of measurement error, so I'm not particularly concerned.

[SimonSapin]

servo/rust-mozjs#512 has landed

@bors-servo r=Manishearth

[bors-servo]

📌 Commit d103e06 has been approved by Manishearth

[bors-servo]

⌛ Testing commit d103e06 with merge 06c4ca1...

[bors-servo]

☀️ Test successful - status-taskcluster
Approved by: Manishearth
Pushing 06c4ca1 to master...