[wasm] Replace RecursiveMutex by Mutex
Some of the methods in {WasmCodeAllocator} can be called either without holding the lock, or while already holding it. In order to support both situations, we used a {RecursiveMutex} so far. This CL refactors this to be a simple {Mutex} again, and passes a {WasmCodeAllocator::OptionalLock} object which stores whether the lock is already held or not. Note that getting the lock twice fails immediately in debug builds, while forgetting to get the lock might only fail on TSan. The alternative would be to duplicate all methods, having one variant that expects that the lock is held and one that assume that it's unlocked. It would be multiple methods though to duplicate across both {NativeModule} and {WasmCodeAllocator}, hence I went for the {OptionalLock} instead. Bug: v8:9477 R=mstarzinger@chromium.org Change-Id: I4e32286cdb93385ac655d408191b330efdd7ad66 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1825338 Commit-Queue: Clemens Backes <clemensb@chromium.org> Reviewed-by: Michael Starzinger <mstarzinger@chromium.org> Cr-Commit-Position: refs/heads/master@{#64137}
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