Crash on 5.7 when running with the Vulkan RHI and async compute

Making this a placeholder for now. Will fill out the description asap

1. Create a template project
   2. Add support for vulkan async through the device profile
   3. Open the project with the Vulkan RHI (-vulkan)
   4. Observe a crash

From Integration Request

Yeah, if you just add r.Vulkan.AllowAsyncCompute=1 (in your ConsoleVariables.ini or at the cmdline) while running a Blank project, it'll crash right away without the fix.  It should work with the fix.  (the point isn't to fix async compute per say since it's disabled by default, but it's the easiest most consistent repro