RFR (XS): [8u] Bump the inlining limits for concurrent mark

[Aleksey Shipilev]

This is a port of the similar change from 9:
  http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/9fef7865556f

Takes a little different form for 8, and also requires a few more includes:
  http://cr.openjdk.java.net/~shade/shenandoah/jdk9-8u/inline-hints/webrev.01/

Produces much better inlining now, and concurrent mark times are improving.

Testing: hotspot_gc_shenandoah, eyeballing inlining trees

Thanks,
-Aleksey