RFR: 8270187: G1: Remove ConcGCThreads constraint

Mon Jul 12 15:20:29 UTC 2021

Removing `ConcGCThreads <= ParallelGCThreads` constraint for G1.

Tested: hotspot_gc with `-XX:ConcGCThreads=3 -XX:ParallelGCThreads=2`

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Commit messages:
 - conc-constraint

Changes: https://git.openjdk.java.net/jdk/pull/4756/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4756&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8270187
  Stats: 19 lines in 5 files changed: 0 ins; 17 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4756.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4756/head:pull/4756

PR: https://git.openjdk.java.net/jdk/pull/4756