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Michael Sproul 317dc0f56c Fix malloc_utils features (sysmalloc) (#7770 )

Follow-up to:

- https://github.com/sigp/lighthouse/pull/7764

The `heaptrack` feature added in my previous PR was ineffective, because the jemalloc feature was turned on by the Linux target-specific dependency.

This PR tweaks the features such that:

- The jemalloc feature is just used to control whether jemalloc is compiled in. It is enabled on Linux by the target-specific dependency (see `lighthouse/Cargo.toml`), and completely disabled on Windows.
- If the `sysmalloc` feature is set on Linux then it overrides jemalloc when selecting an allocator, _even if_ the jemalloc feature is enabled (and the jemalloc dep was compiled).

2025-08-15 03:46:38 +00:00