Add regression test for fix from r14732.

test/mjsunit/regress/regress-crbug-242502.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
 //       with the distribution.
 //     * Neither the name of Google Inc. nor the names of its
 //       contributors may be used to endorse or promote products derived
 //       from this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Test whether the opening parenthesis can be eaten up by a comment.
-assertThrows('Function("/*", "*/){");', SyntaxError);
+// Flags: --expose-gc --allow-natives-syntax
 
-// Test whether the function literal can be closed prematurely.
-assertThrows('Function("});(function(){");', SyntaxError);
+function f() {
+  return 23;
+}
 
-// Test whether block comments are handled correctly.
-assertDoesNotThrow('Function("/*", "*/", "/**/");');
-assertDoesNotThrow('Function("/*", "a", "*/", "/**/");');
-assertThrows('Function("a", "/*", "*/", "/**/");', SyntaxError);
+function call(o) {
+  return o['']();
+}
 
-// Test whether line comments are handled correctly.
-assertDoesNotThrow('Function("//", "//")');
-assertDoesNotThrow('Function("//", "//", "//")');
-assertThrows('Function("a", "//", "//")', SyntaxError);
+function test() {
+  var o1 = %ToFastProperties(Object.create({ foo:1 }, { '': { value:f }}));
+  var o2 = %ToFastProperties(Object.create({ bar:1 }, { '': { value:f }}));
+  var o3 = %ToFastProperties(Object.create({ baz:1 }, { '': { value:f }}));
+  var o4 = %ToFastProperties(Object.create({ qux:1 }, { '': { value:f }}));
+  var o5 = %ToFastProperties(Object.create({ loo:1 }, { '': { value:f }}));
+  // Called twice on o1 to turn monomorphic.
+  assertEquals(23, call(o1));
+  assertEquals(23, call(o1));
+  // Called on four other objects to turn megamorphic.
+  assertEquals(23, call(o2));
+  assertEquals(23, call(o3));
+  assertEquals(23, call(o4));
+  assertEquals(23, call(o5));
+  return o1;
+}
 
-// Some embedders rely on the string representation of the resulting
-// function in cases where no formal parameters are specified.
-var asString = Function("return 23").toString();
-assertSame("function anonymous() {\nreturn 23\n}", asString);
+// Fill stub cache with entries.
+test();
+
+// Clear stub cache during GC.
+gc();
+
+// Turn IC megamorphic again.
+var oboom = test();
+
+// Optimize with previously cleared stub cache.
+%OptimizeFunctionOnNextCall(call);
+assertEquals(23, call(oboom));