Move backend to Adapt.

N5N3 · N5N3 · commit 3fd8c29d35ee · 2022-02-21T10:03:22.000+08:00
diff --git a/src/device/execution.jl b/src/device/execution.jl
@@ -1,4 +1,7 @@
 # kernel execution
+if isdefined(Adapt, :backend)
+    import Adapt: backend
+end
 
 export AbstractGPUBackend, AbstractKernelContext, gpu_call
 
