ios jit support p l5ga #1
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Implements comprehensive JIT support for iOS with three operating modes: - Legacy mode (iOS < 26): Toggle W^X using mprotect() - LuckNoTXM mode (iOS 26+ without TXM): RW/RX mirrors per allocation via vm_remap() - LuckTXM mode (iOS 26+ with TXM): Pre-allocated 512MB region with lwmem allocator Changes: - Added lwmem submodule for dynamic memory management in LuckTXM mode - Created MemoryUtil.h public API with AllocateExecutableMemory/FreeExecutableMemory - Implemented dispatcher (MemoryUtil_iOS.cpp) to route calls based on JIT type - Created mode-specific implementations: * MemoryUtil_iOS_Legacy.cpp - mprotect() toggle for iOS < 26 * MemoryUtil_iOS_LuckNoTXM.cpp - Per-allocation vm_remap() for iOS 26+ * MemoryUtil_iOS_LuckTXM.cpp - 512MB pre-allocated region with TXM support - Added JITMemoryTracker for thread-safe region tracking in Legacy mode - Updated CMakeLists.txt to conditionally build iOS files and link lwmem Architecture: - Modular design allows runtime selection of JIT mode via SetJitType() - LuckTXM uses ARM64 breakpoint instruction (brk #0x69) to signal TXM - All modes provide clean separation between readable-executable (RX) and readable-writable (RW) memory regions as required by iOS security model Based on Dolphin iOS JIT implementation adapted for Play! PS2 Emulator.
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