hg: valhalla/valhalla: 8222711: [lworld] Initial skeletal implementation of inline class instance construction via <init>

[John Rose]

http://cr.openjdk.java.net/~jrose/jvm/JDK-8222787/

This seems to work.  It builds in fastdebug mode and passes
the eight jtreg tests in test/jdk/valhalla/*.  It also passes
most of the tests in test/hotspot/jtreg/runtime/valhalla/*.

I hacked your option logic, Srikanth, to force javac to use
the new mode all the time.  This made it easier to verify
that things were working—and that change is yours to
roll back.

The method handle logic changes are untested and
probably broken.

(Anybody want to co-pilot these changes? :-)

— John

P.S. To those celebrating, Happy Easter!

On Apr 20, 2019, at 11:48 AM, John Rose <john.r.rose at oracle.com> wrote:
> 
> I've been wanting to do this for some time.  I'll take a crack at it.
> 
>> On Apr 20, 2019, at 8:19 AM, Srikanth <srikanth.adayapalam at oracle.com> wrote:
>> 
>> JVM folk:
>> 
>> I have raised https://bugs.openjdk.java.net/browse/JDK-8222787 ([lworld] JVM should be enhanced to work with static <init> factory methods for inline types) in connection with this.