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interp: support atomic operations in global initializers - #5993
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Package-level initializers can now use sync/atomic operations while TinyGo evaluates global variables. The interpreter handles atomicrmw and cmpxchg instructions in memory it owns, covering Add, And, Or, Swap, and CompareAndSwap without matching function names. This is safe during initialization because no other execution contexts exist yet. Volatile operations and external memory remain runtime operations.
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Package-level initializers can now use sync/atomic operations while TinyGo evaluates global variables. The interpreter supports LLVM atomicrmw and cmpxchg for interpreter-owned memory, covering Add, And, Or, Swap, and CompareAndSwap without matching function names.
No competing execution contexts exist during initialization, so these operations can be evaluated as loads and stores. Volatile operations and external memory remain runtime operations.
Tests add interpreter coverage for atomicrmw and cmpxchg, plus global-initializer coverage for sync/atomic.