Request for reviews (S): 6926782: CodeBuffer size too small after 6921352

[Christian Thalinger]

http://cr.openjdk.java.net/~twisti/6926782/webrev.01/
	
In the changes for 6921352 I forgot to increase the CodeBuffer size
and thus we sometimes get an assert when generating code:

# Internal Error
(/tmp/jprt/P1/B/233753.kvn/source/src/share/vm/asm/codeBuffer.hpp:169),
pid=26304, tid=3011459984
# Error: assert(allocates2(pc),"")

The fix is to increase the CodeBuffer size.  Additionally I changed
the code to emit the deopt MH handler only when it's required.

-- Christian