RFR: 8283790: G1: Remove redundant card/heap-address transition

Mon Mar 28 13:41:01 UTC 2022

Simple change of removing some unnecessary code.

(Also checked the assembly in `release` build and these redundant transitions are *not* optimized away.)

Test: hotspot_gc

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Commit messages:
 - g1-bot-cleanup

Changes: https://git.openjdk.java.net/jdk/pull/7995/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7995&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8283790
  Stats: 59 lines in 2 files changed: 0 ins; 23 del; 36 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7995.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7995/head:pull/7995

PR: https://git.openjdk.java.net/jdk/pull/7995