RFR: 8186163: bad signatures should be detected by MetaAccessProvider.parseMethodDescriptor

[Doug Simon]

Thanks for the review.

> On 14 Aug 2017, at 22:44, Igor Veresov <igor.veresov at oracle.com> wrote:
> 
> Looks good to me too.
> 
> igor
> 
>> On Aug 12, 2017, at 4:05 AM, Doug Simon <doug.simon at oracle.com> wrote:
>> 
>> Please review this small change to improve error handling when an invalid string is passed to MetaAccessProvider.parseMethodDescriptor
>> 
>> https://bugs.openjdk.java.net/browse/JDK-8186163
>> http://cr.openjdk.java.net/~dnsimon/8186163/
>> 
>> -Doug
>