trunk/82e11efd09479cfbae9c03a174fa4714b09d1f89: [BE] Move MetalShaderLibrary cache guard out of the class (#197837)

发生了什么

The guard that landed in #167541 uses std::recursive_mutex , that changes sizeof(MetalShaderLibrary) and therefore breaks ABI with existing out-of-tree C++ extensions, and recursive calls were made from other methods within the same class. Make it a file-static std::mutex in OperationUtils.mm, where every accessor that touches library caches are defined. Dropping recursion means untangling the two chains that nested…

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