RFR (S) CR 8015270: @Contended: fix multiple issues in the layout code

[Aleksey Shipilev]

Hi,

Here's the merged changeset:
  http://cr.openjdk.java.net/~shade/8015270/webrev.01/

Summary:
 - has_nonstatic_fields bug fixed
 - oop_map overrun is fixed
 - parsed_annotations->in_contended() cleaned up
 - asserts added to cover the regression tests

Testing:
 - all HS regression tests
     (have a few environmental failures, but nothing new)
 - full JPRT cycle against hotspot-rt
     (passes OK)

Still no luck getting vm.quick to work in my environment even for the
JDK 8 EA builds, I'll update with the report later. Early comments are
welcome anyway.

Coleen, I got your idea of incrementing fac[...] a try, but it turns
more messy than current code (fac is actually coming from outside to
layout_fields, and I think it is a sane idea to keep it the same).

-Aleksey.