Reimplement Atomic::cmpxchg as a template. One goal is to generalize the API and make it more type-safe, eliminating the need for most casts. This includes replacing the type-information-losing cmpxchg_ptr with type-safe cmpxchg. Another goal is to allow more direct platform-specific implementation of the generic operation, for platforms that support that via generic intrinsics.
Subtask ofJDK-8184334, addressing only Atomic::cmpxchg.
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JDK-8186734 AIX build broken after 8186166: Generalize Atomic::cmpxchg with templates
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JDK-8186476 Generalize Atomic::add with templates
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