Request for reviews (XS): 7017240: C2: native memory leak in nsk/regression/b4675027 on windows-x86 in comp mode with G1

[Vladimir Kozlov]

http://cr.openjdk.java.net/~kvn/7017240/webrev

Fixed 7017240: C2: native memory leak in nsk/regression/b4675027 on windows-x86 in comp mode with G1

C2 adds additional code for G1 barriers so ideal graph
may become larger then with other collectors.
Also the compiled method itself is huge: 7102 bytes.
Main part of the problem is memory resources usage during
escape analysis and it will be resolved with 7013538 fix.
But I also noticed that PhaseIdealLoop::build_and_optimize()
allocates next arrays without freeing resources on exit
(there is no ResourceMark):

   _idom      = NEW_RESOURCE_ARRAY( Node*, _idom_size );
   _dom_depth = NEW_RESOURCE_ARRAY( uint,  _idom_size );

Add ResourceMark.