review(XS): 7085279: C1 overflows code buffer with VerifyOops and CompressedOops

[Igor Veresov]

This happens during emission of LIR_OpAllocObj. C1 assumes that a LIR instruction will fit into 1K but in this case it's not true because the allocation code is pretty large by itself and oop verfication adds an order of magnitude more of additional code. 

I bumped up the size of the code per LIR operation to 2K. And also increased the size of the NMethodSizeLimit to accommodate all the verification code emitted. 

Webrev: http://cr.openjdk.java.net/~iveresov/7085279/webrev.00/

Thanks,
igor