RFR: Loom support for RedefineClasses [v3]

[Coleen Phillimore]

> Use _marking_cycle to determine whether a Method* is on the heap.
> This patch includes the patches for https://github.com/openjdk/jdk/pull/3852 and https://git.openjdk.java.net/jdk/pull/3861 which are going to be pushed to mainline.

Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:

  Remove RedefineTest from ProblemList.

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Changes:
  - all: https://git.openjdk.java.net/loom/pull/38/files
  - new: https://git.openjdk.java.net/loom/pull/38/files/57e956ec..1bc4a22b

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=loom&pr=38&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=loom&pr=38&range=01-02

  Stats: 7 lines in 1 file changed: 6 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/loom/pull/38.diff
  Fetch: git fetch https://git.openjdk.java.net/loom pull/38/head:pull/38

PR: https://git.openjdk.java.net/loom/pull/38