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* build: enable V8 builtins PGO Removes the gn arg that disabled V8 builtins profile-guided optimization and adds a V8 patch to warn instead of abort when the builtin PGO profile data does not match. Also strips the PGO-related flags from the generated mksnapshot_args so they are not passed through to downstream mksnapshot invocations. * docs: clarify Node.js async_hooks as reason for promise_hooks flag Addresses review feedback: the v8_enable_javascript_promise_hooks flag is set to support Node.js async_hooks, not used directly by Electron.