Don't allocate random numbers on the GPU during launch.

Author: maleadt

src/compiler/execution.jl

@@ -275,7 +275,7 @@ end
     (threads.width * threads.height * threads.depth) > kernel.pipeline.maxTotalThreadsPerThreadgroup &&
         throw(ArgumentError("Number of threads in group ($(threads.width * threads.height * threads.depth)) should not exceed $(kernel.pipeline.maxTotalThreadsPerThreadgroup)"))
 
-    kernel_state = KernelState(rand(UInt32))
+    kernel_state = KernelState(Random.rand(UInt32))
 
     cmdbuf = MTLCommandBuffer(queue)
     cmdbuf.label = "MTLCommandBuffer($(nameof(kernel.f)))"