loading base handle crashes in release

[Avokadoen]

This is the same issue that zig_vulkan is currently suffering from.
Building in debug works fine, but when building a release build it will fail to load the base handle at these lines

graphics_context.zig: line 98-99

const vk_proc = @ptrCast(fn(instance: vk.Instance, procname: [*:0]const u8) vk.PfnVoidFunction, glfw.getInstanceProcAddress);
self.vkb = try BaseDispatch.load(vk_proc);

Terminal:

$ zig build run -Drelease-safe
thread 1030138 panic: reached unreachable code
The following command terminated unexpectedly:
cd /home/aksel/Projects/mach-glfw-vulkan-example && /home/aksel/Projects/mach-glfw-vulkan-example/zig-out/bin/mach-glfw-vulkan-example 
error: the following build command failed with exit code 1:
/home/aksel/Projects/mach-glfw-vulkan-example/zig-cache/o/9eb30b7963903b666b1f2550cdaaa19e/build /snap/zig/4321/zig /home/aksel/Projects/mach-glfw-vulkan-example /home/aksel/Projects/mach-glfw-vulkan-example/zig-cache /home/aksel/.cache/zig run -Drelease-safe

[Avokadoen]

Seems like replacing the mach implementation resolved the issue:

replace

pub fn getInstanceProcAddress(vk_instance: ?*opaque {}, proc_name: [*:0]const u8) callconv(.C) ?VKProc {
    const proc_address = c.glfwGetInstanceProcAddress(if (vk_instance) |v| @ptrCast(c.VkInstance, v) else null, proc_name);
    getError() catch |err| @panic(@errorName(err));
    if (proc_address) |addr| return addr;
    return null;
}

with

pub const getInstanceProcAddress = c.glfwGetInstanceProcAddress;

[Avokadoen]

Fix described by @InKryption here