RFR: 8218565: HandleMark cleanup

[Kim Barrett]

> On Feb 6, 2019, at 10:45 AM, Claes Redestad <claes.redestad at oracle.com> wrote:
> 
> Hi,
> 
> after JDK-8218145 I noticed HandleMark::pop_and_restore became outlined
> in places where it was previously inlined. Analyzing the code it seems
> there are a few calls in that method that are rarely taken, so inlining
> could be helped by outlining these. Doing so marginally helps static
> footprint and a small reduction in instructions retired on some startup
> tests on linux-x64.
> 
> When in the neighborhood I noticed some code duplication between
> ~HandleMark and pop_and_restore, along with a now unused debugging
> counter (_nof_handlemarks - use was removed by JDK-8146850).
> 
> Webrev: http://cr.openjdk.java.net/~redestad/8218565/open.00/
> Bug:    https://bugs.openjdk.java.net/browse/JDK-8218565
> 
> Testing: tier1+2, verified pop_and_restore gets inlined in more places
> with a smaller footprint cost
> 
> Thanks!
> 
> /Claes

Looks good.