[interpreter] Skip failing generator regression test.

TBR=rmcilroy@chromium.org,machenbach@chromium.org
TEST=mjsunit/regress/regress-crbug-513471
BUG=chromium:513471
LOG=n

Review URL: https://codereview.chromium.org/1859523003

Cr-Commit-Position: refs/heads/master@{#35240}

test/mjsunit/mjsunit.status

@@ -823,6 +823,9 @@
   # TODO(rmcilroy,4680): Crash on windows nosnap shared.
   'regress/regress-crbug-352058': [PASS, ['no_snap == True', SKIP]],
 
+  # TODO(513471): Attempting to optimize generator hits unreachable path.
+  'regress/regress-crbug-513471': [PASS, ['no_snap == True', SKIP]],
+
   # TODO(rmcilroy,4680): Fails on win32 debug.
   'div-mod': [PASS, ['arch == ia32', SKIP]],
 }],  # ignition == True and system == windows