RFR: 8270912: Clean up G1CollectedHeap::process_discovered_references() [v2]

[Thomas Schatzl]

> Hi all,
> 
>   can I have reviews for this cleanup of `G1CollectedHeap::process_discovered_references()`, cleaning out obsolete or duplicate code and moving asserts?
> 
> Testing: tier1-5
> 
> Thanks,
>   Thomas

Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:

  kbarrett review

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4857/files
  - new: https://git.openjdk.java.net/jdk/pull/4857/files/97b1e81a..849b4dbf

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4857&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4857&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4857.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4857/head:pull/4857

PR: https://git.openjdk.java.net/jdk/pull/4857