Refactor the compiling pipeline.

test/mjsunit/regress/regress-2618.js

 // Copyright 2013 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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 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --use-osr --allow-natives-syntax
+// Flags: --use-osr --allow-natives-syntax --no-concurrent-osr
 
 function f() {
   do {
     do {
       for (var i = 0; i < 10000000; i++) {
         // This should run long enough to trigger OSR.
       }
     } while (false);
   } while (false);
 }
@@ skipping 24 matching lines @@
             } while (false);
           } while (false);
         } while (false);
       } while (false);
     } while (false);
   } while (false);
 }
 
 g();
 assertTrue(%GetOptimizationCount(g) > 0 || %GetOptimizationStatus(g) == 4);