Fix caching of optimized code for OSR.

test/mjsunit/regress/regress-2326.js

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-// Test both the Harmony egal operator and it's function equivalent.
+// This tests that we do not share optimized code across closures that
+// were optimized using OSR (for a particular OSR entry AST id) even if
+// caching of optimized code kicks in.
 
-function TestEgal(expected, x, y) {
-  // TODO(mstarzinger): Once we have the egal operator, we can test it here.
-  assertSame(expected, Object.is(x, y));
+function makeClosure() {
+  function f(mode, iterations) {
+    var accumulator = 0;
+    if (mode == 1) {
+      while (--iterations > 0) accumulator = Math.ceil(accumulator);
+      return 1;
+    } else {
+      while (--iterations > 0) accumulator = Math.floor(accumulator);
+      return 2;
+    }
+  }
+  return f;
 }
 
-var test_set = [ {}, [], 1/0, -1/0, "s", 0, 0/-1, null, undefined ];
-print(test_set);
-for (var i = 0; i < test_set.length; i++) {
-  for (var j = 0; j < test_set.length; j++) {
-    if (i == j) {
-      assertSame(test_set[i], test_set[j]);
-      TestEgal(true, test_set[i], test_set[j]);
-    } else {
-      TestEgal(false, test_set[i], test_set[j]);
-      TestEgal(false, test_set[j], test_set[i]);
-    }
-  }
-}
+// Generate two closures sharing the same underlying function literal.
+var f1 = makeClosure();
+var f2 = makeClosure();
+
+// This function should be optimized via OSR in the first tight loop.
+assertSame(1, f1(1, 100000));
+
+// This function should be optimized via OSR in the second tight loop.
+assertSame(2, f2(2, 100000));