Add test

Author: jack-slingsby

mlir/test/Dialect/Index/inliner-interface.mlir

@@ -0,0 +1,14 @@
+// RUN: mlir-opt %s -inline | FileCheck %s
+
+// CHECK-LABEL: @main
+func.func @main(%arg0: i32) -> index {
+		// CHECK-NOT: call
+		// CHECK: index.castu
+    %0 = call @f(%arg0) : (i32) -> index
+    return %0 : index
+}
+
+func.func @f(%arg0: i32) -> index {
+    %0 = index.castu %arg0 : i32 to index
+    return %0 : index
+}