Add missing mlir file

Author: Jerry Wu

mlir/test/Dialect/SCF/loop-zero-trip-check.mlir

@@ -0,0 +1,21 @@
+// RUN: mlir-opt %s -test-loop-zero-trip-check -split-input-file  | FileCheck %s
+
+func.func @no_replace_scf_while_with_zero_trip_check(%bound : i32) -> i32 {
+  %cst0 = arith.constant 0 : i32
+  %cst5 = arith.constant 5 : i32
+  %res:2 = scf.while (%iter = %cst0) : (i32) -> (i32, i32) {
+    %cond = arith.cmpi slt, %iter, %bound : i32
+    %inv = arith.addi %bound, %cst5 : i32
+    scf.condition(%cond) %iter, %inv : i32, i32
+  } do {
+  ^bb0(%arg1: i32, %arg2: i32):
+    %next = arith.addi %arg1, %arg2 : i32
+    scf.yield %next : i32
+  }
+  return %res#0 : i32
+}
+
+// TODO(pzread): Update the test once the replaceZeroTripCheck is implemented.
+// CHECK-LABEL: func.func @no_replace_scf_while_with_zero_trip_check
+// CHECK-NOT:     scf.if
+// CHECK:         scf.while