RFR: Cherry-pick: 8204941: Refactor TemplateTable::_new to use MacroAssembler helpers for tlab and eden

[Aleksey Shipilev]

On 06/28/2018 10:09 PM, Roman Kennke wrote:
> Subject says it all. It reduces our upstream footprint a little bit, but
> primarily this is meant to make Roland's life easier with merging some
> conflicting C2 changesets.
> 
> See:
> http://mail.openjdk.java.net/pipermail/shenandoah-dev/2018-June/006565.html
> 
> Webrev:
> http://cr.openjdk.java.net/~rkennke/cherrypick-8204941/webrev.00/

OK, do it.

-Aleksey