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servo/components/script
bors-servo a71470abe5 Auto merge of #18952 - jdm:no-leak-on-shutdown, r=nox
Do not trace Rust values when thread is shutting down.

This addresses a paint point when using debug-mozjs builds. jonco says that it is considered a leak when objects stored in side tables in a SpiderMonkey embedding are traced right before shutting down. This PR adds a per-thread flag that controls whether to run the Rust-side trace hooks, which is automatically toggled before the final GC occurs when destroying a JS runtime.

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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #18948 and fix #18947.
- [x] These changes do not require tests because we don't use debug-mozjs on CI

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