review(XS): 7119294: Two command line options cause JVM to crash.

[Igor Veresov]

Tiered crashed on x64 with -XX:-UseTLAB because the thread register was not setup in MacroAssembler::incr_allocated_bytes()  in case the thread register passed as an argument was noreg.

Webrev: http://cr.openjdk.java.net/~iveresov/7119294/webrev.00/ 

igor

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