[jdk8u-dev] RFR: 8072422: Cleanup: Remove some unused flags/code in loop optimizations [v2]

[Yi Yang]

> We encountered this problem in downstream JDK. This is a backport of JDK-8283672, which simply removes several diagnostic flags, build passed. There is a related fix https://bugs.openjdk.java.net/browse/JDK-8159715, I would backport it after the current fix merged.
> 
> Original changeset: http://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/a1e41855499b
> 
> Please help review it.
> 
> Thanks.

Yi Yang has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  8072422: Cleanup: Remove some unused flags/code in loop optimizations

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Changes:
  - all: https://git.openjdk.java.net/jdk8u-dev/pull/22/files
  - new: https://git.openjdk.java.net/jdk8u-dev/pull/22/files/4b4adcd6..11338be2

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk8u-dev&pr=22&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk8u-dev&pr=22&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk8u-dev/pull/22.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk8u-dev pull/22/head:pull/22

PR: https://git.openjdk.java.net/jdk8u-dev/pull/22