request for review (S)

[Keith McGuigan]

Here's a small fix for:

6756528: Bytecodes::special_length_at reads past end of code buffer

that I would appreciate any reviews for:

http://webrev.invokedynamic.info/kamg/6756528/

There are other paths though this common code where the end of the 
buffer is not checked, but this is the path used by the verifier's 
bytecode parsing routine and thus any invalid code should get caught 
here first.

--
- Keith