Request for reviews (S): 7090259: Fix hotspot sources to build with old compilers

[Vladimir Kozlov]

http://cr.openjdk.java.net/~kvn/7090259/webrev

7090259: Fix hotspot sources to build with old compilers

Fixed warnings which prevent building VM with old compilers. Used non-template 
method_comparator() in sort_methods() since vs2003 generates incorrect optimized 
code for it. Added -xwe compilation flag. Tested with 5.7, 5.8 and 5.10 Sun C++.

I will remove g1ErgoVerbose.hpp changes and push to hotspot-gc since Tony fixed 
it already there.

Thanks,
Vladimir