RFR (XS) 8216049: stringTable::intern creates redundant String when looking up existing one

[zgu at redhat.com]

Looks good to me.

-Zhengyu

On Fri, 2019-02-15 at 20:20 +0100, Aleksey Shipilev wrote:
> RFE:
>  https://bugs.openjdk.java.net/browse/JDK-8216049
> 
> Fix:
>  http://cr.openjdk.java.net/~shade/8216049/webrev.01/
> 
> This is the fix for performance regression in 11 that shows up in
> stack trace generation benchmarks.
> See bug and linked issues for more info. The original patch is
> suggested by Claes. I have been
> looking how to improve it, but eventually backed off any improvements
> on top of it. The simplicity
> of this patch plays well with future backports to 12u and 11u to fix
> the performance regression there.
> 
> Testing: tier1, benchmarks, jdk-submit
> 
> Thanks,
> -Aleksey
>