RFR(S) 8209651: better TLS poll for x64 C2

dean.long at oracle.com dean.long at oracle.com
Tue Aug 21 20:18:14 UTC 2018

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https://bugs.openjdk.java.net/browse/JDK-8209651
http://cr.openjdk.java.net/~dlong/8209651/webrev/

This change allows C2 to use any available register when doing a 
thread-local GC poll.

dl

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