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adc1a6b05c
Fixes illegal instruction (SIGILL) crashes on ARMv8.0 aarch64 CPUs (Cortex-A53, Raspberry Pi 4, AWS a1 instances). ## Root cause Upstream mimalloc force-enables `MI_OPT_ARCH` on arm64, which adds `-march=armv8.1-a` and emits LSE atomic instructions (`casa`, `swpa`, `ldaddl`). These are not available on ARMv8.0 CPUs. ## Fix - Pass `MI_NO_OPT_ARCH=ON` to mimalloc on aarch64 (has priority over `MI_OPT_ARCH` in mimalloc's CMake) - Update WebKit to autobuild-596e48e22e3a1090e5b802744a7938088b1ea860 which explicitly passes `-march` flags to the WebKit build ## Verification Includes QEMU-based baseline CPU verification CI steps (#26571) that catch these regressions automatically.