Properly close the CountOperation value/effect context after leaving the store effect context.

test/mjsunit/regress/post-increment-close-context.js

Index: test/mjsunit/regress/post-increment-close-context.js
diff --git a/test/mjsunit/compare-nil.js b/test/mjsunit/regress/post-increment-close-context.js
similarity index 84%
copy from test/mjsunit/compare-nil.js
copy to test/mjsunit/regress/post-increment-close-context.js
index 0895a31fb80cbe697b678eaa1005926d7d65829f..08ade10f1d80df022324eb77b7991ed130569d76 100644
--- a/test/mjsunit/compare-nil.js
+++ b/test/mjsunit/regress/post-increment-close-context.js
@@ -27,10 +27,16 @@
 
 // Flags: --allow-natives-syntax
 
-function test(v) {
-  return (v == null);
+var foo = {bar: -2};
+function crash() {
+  return !(foo.bar++);
 }
-assertFalse(test(true));
-assertFalse(test(true));
-assertTrue(test(null));
-assertTrue(test(null));
+assertFalse(crash());
+assertEquals(-1, foo.bar);
+%OptimizeFunctionOnNextCall(crash);
+assertFalse(crash());
+assertEquals(0, foo.bar);
+assertTrue(crash());
+assertEquals(1, foo.bar);
+assertFalse(crash());
+assertEquals(2, foo.bar);