RFR (XS): 8218672: AOT code root scanning shows in the wrong position in the logs

[Kim Barrett]

> On Feb 15, 2019, at 8:27 AM, Thomas Schatzl <thomas.schatzl at oracle.com> wrote:
> 
> Hi all,
> 
>  can I have reviews for this small change that fixes the position of
> the "AOT Code Root Scan" phase, moving it to appear under the "Ext Root
> Scan" phase where it is handled in?
> 
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8218672
> Webrev:
> http://cr.openjdk.java.net/~tschatzl/8218672/webrev/
> Testing:
> hs-tier5 (there is some jfr test case that complains if the phase names
> were messed up)
> 
> Thanks,
>  Thomas

Looks good.

It took a while for me to figure out where the printing of the AOT Code Roots time had
gone. It might be nice to have a couple of named constants for the range of ExtRootScan
sub-phases, for use as the iteration bounds in print_evacuate_collection_set.