Request for review(XS): 7014247: CTW fails when compile sun/misc/AtomicLongCSImpl (REMOVED from JDK7)

[Igor Veresov]

CTW fails with assertion when trying to emit LIR for 
AtomicLongCSImpl::attemptUpdate() because it uses arithmetic to compute 
a field address. This fix changes it to use lea.

Webrev: http://cr.openjdk.java.net/~iveresov/7014247/webrev.00/

Thanks,
igor