[mlir][spirv] Add LIT test for vector.interleave to spirv.VectorShuffle (#93189)

The plan is to replace this with a dedicated pattern
fom`vector.interleave` to `spirv.shuffle` in the future.

---------

Co-authored-by: Jakub Kuderski <[email protected]>

Author: angelz913

mlir/test/Conversion/VectorToSPIRV/vector-to-spirv.mlir

@@ -483,6 +483,17 @@ func.func @shuffle(%v0 : vector<1xi32>, %v1: vector<1xi32>) -> vector<2xi32> {
 
 // -----
 
+// CHECK-LABEL: func @interleave
+//  CHECK-SAME: (%[[ARG0:.+]]: vector<2xf32>, %[[ARG1:.+]]: vector<2xf32>)
+//       CHECK: %[[SHUFFLE:.*]] = spirv.VectorShuffle [0 : i32, 2 : i32, 1 : i32, 3 : i32] %[[ARG0]], %[[ARG1]] : vector<2xf32>, vector<2xf32> -> vector<4xf32>
+//       CHECK: return %[[SHUFFLE]]
+func.func @interleave(%a: vector<2xf32>, %b: vector<2xf32>) -> vector<4xf32> {
+  %0 = vector.interleave %a, %b : vector<2xf32>
+  return %0 : vector<4xf32>
+}
+
+// -----
+
 // CHECK-LABEL: func @reduction_add
 //  CHECK-SAME: (%[[V:.+]]: vector<4xi32>)
 //       CHECK:   %[[S0:.+]] = spirv.CompositeExtract %[[V]][0 : i32] : vector<4xi32>