disassemble throws NPE with system classes

[Per Bothner]

On 10/05/2013 03:49 PM, Jamison Hope wrote:
> Calling disassemble on system class methods like Math#asin or
> Object#toString will currently throw a NPE (at least it will with Oracle
> Java 1.7.0_40):
>
....
>
> Patch attached.

Thanks - checked in.
-- 
	--Per Bothner
per@bothner.com   http://per.bothner.com/