Value type array optimizations/fixes with C2

[Tobias Hartmann]

Hi,

http://cr.openjdk.java.net/~thartmann/valhalla/vt_prototype/webrev.07/

please review this change which includes:
- Fixed wrong return value in AddPNode::Value()
- Basic version of ValueArrayKlass::oop_print_on() for debugging
- Fixed escape analysis to keep track of the field being accessed in VT arrays
- Re-enabled asserts in graphKit.cpp and memnode.cpp
- Implemented scalar replacement for flattened value type arrays
- Implemented re-allocation of scalar replaced value type arrays on deoptimization
- Refactored valuetypenode.cpp and related code
- Refactored test bench to use flags from jtreg command line instead of hard-coding command line options
- Enabled/added corresponding regression tests and match rules

There are still some problems with incremental inlining. I disabled the flag for testing and will work on fixing this next.

Thanks,
Tobias