[Isolates] Merge crankshaft (r5922 from bleeding_edge).

test/mjsunit/string-replace-gc.js

 // Copyright 2009 the V8 project authors. All rights reserved.
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 // 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.
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 //       copyright notice, this list of conditions and the following
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 //       from this software without specific prior written permission.
 //
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 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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 // 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
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 // (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: --always-compact
 //
 // Regression test for the r1512 fix.
 
 var foo = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
 
 foo = foo + foo;
 foo = foo + foo;
 foo = foo + foo;
 foo = foo + foo;
 foo = foo + foo;
 foo = foo + foo;
 foo = foo + foo;
 foo = foo + foo;
 foo = foo + foo;
 foo = foo + foo;
 foo = foo + foo;
 foo = foo + foo;
 foo = foo + foo;
 foo = foo + foo;
 foo = foo + foo;
 
 foo.replace(/[b]/, "c");  // Flatten foo.
 
 var moving_string = "b" + "c";
 
 var bar = foo.replace(/[a]/g, moving_string);
 
 print(bar.length);