Added %NeverOptimize runtime call that can disable optimizations for a method for tests.

test/mjsunit/regress/regress-mul-canoverflowb.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
@@ skipping 13 matching lines @@
 // 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.
 
 // Flags: --allow-natives-syntax
 
 function boom(a) {
   return ((a | 0) * (a | 0)) | 0;
 }
 function boom_unoptimized(a) {
-  try {} catch(_) {}
+  %NeverOptimize();
   return ((a | 0) * (a | 0)) | 0;
 }
 
 boom(1, 1);
 boom(2, 2);
 
 %OptimizeFunctionOnNextCall(boom);
 var big_int = 0x5F00000F;
 var expected = boom_unoptimized(big_int);
 var actual = boom(big_int)
 assertEquals(expected, actual);