RFR: 8256814: WeakProcessorPhases may be redundant [v2]

[Kim Barrett]

> Please review this change which eliminates the WeakProcessorPhase class.
> 
> The OopStorageSet class is changed to provide scoped enums for the different
> categories: StrongId, WeakId, and Id (for the union of strong and weak).
> An accessor is provided for obtaining the storage corresponding to a
> category value.
> 
> Various other enumerator ranges, array sizes and indices, and iterations are
> derived directly from the corresponding OopStorageSet category's enum range.
> 
> Iteration over a category of enumerators can be done via EnumIterator.  The
> iteration over storage objects makes use of that enum iteration, rather than
> having a bespoke implementation.  Some use-cases need iteration of the
> enumerators, with storage lookup from the enumerator; other use-cases just
> need the storage objects.
> 
> Testing:
> mach5 tier1-6
> Local (linux-x64) hotspot:tier1 with -XX:+UseShenandoahGC

Kim Barrett has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains three commits:

 - Merge branch 'master' into wpp4
 - stefank review
 - Remove WeakProcessorPhase, adding scoped enum categories to OopStorageSet.

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Changes: https://git.openjdk.java.net/jdk/pull/1862/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1862&range=01
  Stats: 1042 lines in 25 files changed: 400 ins; 465 del; 177 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1862.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1862/head:pull/1862

PR: https://git.openjdk.java.net/jdk/pull/1862