review(XXS): 7160539: JDeveloper crashes on 64-bit Windows

[Igor Veresov]

In 64-bit C2 expects upper 32bit cleared for the int params passed to a method. C1 was leaving them dirty while doing l2i conversion on x64, which caused a problem with the tiered runtime. 

Webrev: http://cr.openjdk.java.net/~iveresov/7160539/webrev.00/

Thanks!
igor

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