Disable optimization for loader_create_device_chain

Vulkan CTS crashes when running test case dEQP-VK.api.object_management.single.device_group.
The root cause is a compiler issue when optimization (-O2) is enabled.

The problem occurs on embedded Linux (aarch64) using gcc
aarch64-buildroot-linux-gnu-gcc.br_real (Buildroot 2020.08) 9.3.0

Author: LeoXu240

loader/loader.c

@@ -4915,17 +4915,13 @@ void loader_activate_instance_layer_extensions(struct loader_instance *inst, VkI
                                                   created_inst);
 }
 
-#if defined(__APPLE__)
-VkResult loader_create_device_chain(const VkPhysicalDevice pd, const VkDeviceCreateInfo *pCreateInfo,
-                                    const VkAllocationCallbacks *pAllocator, const struct loader_instance *inst,
-                                    struct loader_device *dev, PFN_vkGetInstanceProcAddr callingLayer,
-                                    PFN_vkGetDeviceProcAddr *layerNextGDPA) __attribute__((optnone)) {
-#else
+#if defined(__APPLE__) || defined(__GNUC__)
+__attribute__((optimize("O0")))
+#endif
 VkResult loader_create_device_chain(const VkPhysicalDevice pd, const VkDeviceCreateInfo *pCreateInfo,
                                     const VkAllocationCallbacks *pAllocator, const struct loader_instance *inst,
                                     struct loader_device *dev, PFN_vkGetInstanceProcAddr callingLayer,
                                     PFN_vkGetDeviceProcAddr *layerNextGDPA) {
-#endif
     uint32_t num_activated_layers = 0;
     struct activated_layer_info *activated_layers = NULL;
     VkLayerDeviceLink *layer_device_link_info;