Andrew Kelley d210f733f8 std.Progress: fix data race ...

In end(), the freelist pointer is owned so the bare store would be ok.
However, there is a load in start() that can happen at the same time, if
another start() and end() pair grabs that same index.

I don't think this fixes #21663 actually because even if the data race
corrupts the value for `next`, the cmpxchg protects the value from being
stored there.

2024-10-23 13:47:44 -07:00

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