Comment 37 for bug 1583849

Oh, wait a second. This crash happens because we are missing an implementation for sparc64 here:

static uint8_t**
ContextToPC(CONTEXT* context)
{
#ifdef KNOWS_MACHINE_STATE
    return reinterpret_cast<uint8_t**>(&PC_sig(context));
#else
    MOZ_CRASH();
#endif
}

js/src/wasm/WasmSignalHandlers.cpp