[mjsunit] Speed up a slow test.

Bug: v8:7783
Change-Id: If351c07735b583816389b77d4077b3494571626f
Reviewed-on: https://chromium-review.googlesource.com/1071441
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53337}

test/mjsunit/mjsunit.status

@@ -790,7 +790,6 @@
   # Slow tests: https://crbug.com/v8/7783
   'lexicographic-compare': [SKIP],
   'regress/regress-2185': [SKIP],
-  'regress/regress-deep-proto': [SKIP],
   'wasm/grow-memory': [SKIP],
 }],  # variant == nooptimization and (arch == arm or arch == arm64) and simulator_run
 

test/mjsunit/regress/regress-deep-proto.js

@@ -25,6 +25,8 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+// Flags: --allow-natives-syntax
+
 function poly(x) {
   return x.foo;
 }
@@ -38,8 +40,12 @@ three.__proto__.__proto__.__proto__ = {};
 three.__proto__.__proto__.__proto__.__proto__ = {};
 three.__proto__.__proto__.__proto__.__proto__.__proto__ = {};
 
-for (var i = 0; i < 1e6; i++) {
-  poly(one);
-  poly(two);
-  poly(three);
-}
+poly(one);
+poly(two);
+poly(three);
+
+%OptimizeFunctionOnNextCall(poly);
+
+poly(one);
+poly(two);
+poly(three);