RFR: 8218738: Remove dead code in Symbol and friends

[David Holmes]

On 12/02/2019 12:58 am, Claes Redestad wrote:
> Hi,
> 
> JDK-8218675 is removing the last use of Symbol::as_utf8_flexible_buffer.
> This patch removes it, along with a few other methods, declarations etc
> in the area which are also no longer in use.

I'm again having reservations about removing utility functions like 
from_quoted_ascii. I would have expected from_quoted_ascii to be used 
in-part to test as_quoted_ascii.

David
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> Webrev: http://cr.openjdk.java.net/~redestad/8218738/open.00/
> Bug:    https://bugs.openjdk.java.net/browse/JDK-8218738
> 
> Testing: tier1
> 
> Thanks!
> 
> /Claes