review(XXS): 7159766: Tiered compilation causes performance regressions

[Igor Veresov]

It's been decided to turn tiered compilation off by default in 7u4 because of the performance anomalies with Oracle FMW. 

Webrev: http://cr.openjdk.java.net/~iveresov/7159766/webrev.00/

Thanks!
igor

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