RFR: 8210972: Add comment text to C1 patching code

[Vladimir Kozlov]

Looks good. what is 'NB:'?

Thanks,
Vladimir

On 9/20/18 10:32 AM, Andrew Haley wrote:
> John Rose explained how our patching algorithm is supposed to
> work. This information is much too useful to languish in an email.
> 
> http://cr.openjdk.java.net/~aph/8210972/
>