Review request (7u) JDK-8038440: backport few C2 fixes

[Poonam Bajaj]

Bug: JDK-8038440 <https://bugs.openjdk.java.net/browse/JDK-8038440>: 
backport few C2 fixes
Webrev: http://cr.openjdk.java.net/~poonam/8038440/webrev.00/

These changes backport few C2 fixes to 7u. Changes backported:
1. Move disabling UseOptoBiasInlining after the last change to 
UseBiasedLocking in src/share/vm/runtime/arguments.cp.
2. In OptoRuntime::new_named_counter() in src/share/vm/opto/runtime.cpp 
file, cmpxchg may fail first time when new named counter is added. It 
triggers assert in set_next() because _next is set already. Fix it by 
resetting _next for each attempt.

Testing:
JPRT

Thanks,
Poonam

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