Add test for reading attached target

Author: umangyadav

mlir/test/Conversion/GPUToROCDL/gpu-to-rocdl-infer-target.mlir

@@ -0,0 +1,12 @@
+// RUN: mlir-opt %s -convert-gpu-to-rocdl -split-input-file | FileCheck %s
+
+// CHECK: @test_module [#rocdl.target<O = 3, chip = "gfx90a">]  attributes {llvm.data_layout = "e-p:64:64-p1:64:64-p2:32:32-p3:32:32-p4:64:64-p5:32:32-p6:32:32-p7:160:256:256:32-p8:128:128-p9:192:256:256:32-i64:64-v16:16-v24:32-v32:32-v48:64-v96:128-v192:256-v256:256-v512:512-v1024:1024-v2048:2048-n32:64-S32-A5-G1-ni:7:8:9"} {
+gpu.module @test_module [#rocdl.target<O = 3, chip = "gfx90a">] {
+  // CHECK-LABEL: @kernel_func
+  // CHECK: attributes
+  // CHECK: gpu.kernel
+  // CHECK: rocdl.kernel
+  gpu.func @kernel_func() kernel {
+    gpu.return
+  }
+}