RFR: jdk 9b170 merge

[Aleksey Shipilev]

Hi,

Merge from http://hg.openjdk.java.net/jdk9/jdk9/ at jdk-9+170 is ready, merged
without conflicts:
 http://cr.openjdk.java.net/~shade/shenandoah/merge-jdk9b170/

Comes with Module System update, JVMCI updates, string/symbol table leak fix,
and a bunch of compiler fixes. Does not require jtreg. Passes
hotspot_gc_shenandoah fine in both release and fastdebug.

Ok to push?

-Aleksey