Implement precise pthread wakeups#26659
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This change implements the design in docs/design/01-precise-futex-wakeups.md Note: As part of this change the definition of emscripten_futex_wait was changes to explicitly allow spurious wakeups. Fixes: emscripten-core#26633
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This change implements the design in docs/design/01-precise-futex-wakeups.md.
As part of this change emscripten_futex_wait API now explicitly allows spurious wakeups, much like the corresponding linux syscall. There were a couple of tests that were using
emscripten_futex_waitwithout a loop, so I added loops to them in an abundance of caution.I also rolled the posixtestsuite submodule so that in now includes emscripten-core/posixtestsuite#12, which was needed because that test becoming more flaky with this change.
Fixes: #26633