[7u-dev] Request for approval: 8038440: backport few C2 fixes

[Poonam Bajaj]

Hi,
This is a request to integrate fix for 8038440  to JDK7u-dev.:

Bug: JDK-8038440 <https://bugs.openjdk.java.net/browse/JDK-8038440>: 
backport few C2 fixes
Webrev: http://cr.openjdk.java.net/~poonam/8038440/webrev.01/

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.

Code Reviewed by:
Vladimir Kozlov , Kevin Walls

Testing:
JPRT

Thanks,
Poonam