Improvements for x87 stack handling

test/mjsunit/external-array-no-sse2.js

 // Copyright 2012 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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 //       with the distribution.
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 //       from this software without specific prior written permission.
 //
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-// Flags: --allow-natives-syntax --expose-gc
+// Flags: --allow-natives-syntax --expose-gc --noenable-sse2
 
 // Helper
 function assertInstance(o, f) {
   assertSame(o.constructor, f);
   assertInstanceof(o, f);
 }
 
 // This is a regression test for overlapping key and value registers.
 function f(a) {
   a[0] = 0;
@@ skipping 668 matching lines @@
 
 built_in_array = new Array(1.5, 2, 3, 4, 5, 6);
 assertEquals(1.5, goo(built_in_array, 0));
 assertEquals(1.5, goo(built_in_array, 0));
 %OptimizeFunctionOnNextCall(goo);
 %OptimizeFunctionOnNextCall(boo);
 boo(built_in_array, 0, 2.5);
 assertEquals(2.5, goo(built_in_array, 0));
 %ClearFunctionTypeFeedback(goo);
 %ClearFunctionTypeFeedback(boo);