[build] Update to V8 15.3 - #7189
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September 1, 2026 09:19
Rebase the workerd patch stack and update ICU and Perfetto to the revisions specified by V8. Adapt memory.discard to V8's current shared-memory and backing-store APIs. Refresh Perfetto's dependency configuration for v58.2. Rework the ExtendedMap Windows layout fix for V8 15.3. Move JSInterceptorMap's non-tagged flags and padding into ExtendedMap so Torque and C++ offsets stay aligned under MSVC without changing the object size or GC boundary.
Synchronous GC conservatively scans native stack values and can retain the weak target depending on platform code generation. Use V8's stackless asynchronous major GC so the test deterministically exercises the queued-delivery lifetime path.
danlapid
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Sep 1, 2026
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