[llvm] [mlir] [mlir][Interfaces][NFC] Add TableGen test op for value bounds tests (PR #88717)

[Benjamin Maxwell via llvm-commits]

================
@@ -2184,6 +2184,53 @@ def ForwardBufferOp : TEST_Op<"forward_buffer", [Pure]> {
   let results = (outs AnyRankedOrUnrankedMemRef:$result);
 }
 
+//===----------------------------------------------------------------------===//
+// Test ValueBoundsOpInterface
+//===----------------------------------------------------------------------===//
+
+def ReifyBoundOp : TEST_Op<"reify_bound", [Pure]> {
+  let description = [{
+    Reify a bound for the given index-typed value or dimension size of a shaped
+    value. "LB", "EQ" and "UB" bounds are supported. If `scalable` is set, a
+    bound in terms of "vector.vscale" is computed. `vscale_min` and `vscale_max`
+    must be specified in that case.
----------------
MacDue wrote:

nit: I think this could be phrased a little better, maybe: 
```suggestion
    Reify a bound for the given index-typed value or dimension size of a shaped
    value. "LB", "EQ" and "UB" bounds are supported. If `scalable` is set, 
    `vscale_min` and `vscale_max` must be provided, which allows computing
    a bound in terms of "vector.vscale" for a given range of vscale.
```

https://github.com/llvm/llvm-project/pull/88717