RFR: Add support of lzcnt and tzcnt

Igor Veresov igor.veresov at oracle.com
Sat Nov 15 07:30:10 UTC 2014

The change adds the following:
- support of lzcnt and tzcnt instructions,
- unit tests for lzcnt/tzcnt,
- ability to emit bsf/bsr in case lzcnt/tzcnt were turned off from the command line,
- tightening the stamps produced by ScanBitForward/ReverseNode nodes.

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


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