RFR: 8368724: RISC-V: Remove AvoidUnalignedAccesses Flag [v7]

[Anjian Wen]

> According to the discuss in https://github.com/openjdk/jdk/pull/27445#, we can use UseUnalignedAccesses and !UseUnalignedAccesses to cover the AvoidUnalignedAccesses Flag, so I Remove the AvoidUnalignedAccesses Flag in this patch

Anjian Wen has updated the pull request incrementally with one additional commit since the last revision:

  move the use of UseUnalignedAccesses flag after it properly assigned.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/27510/files
  - new: https://git.openjdk.org/jdk/pull/27510/files/6eb1dd95..bdb18ae6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27510&range=06
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27510&range=05-06

  Stats: 16 lines in 2 files changed: 7 ins; 9 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/27510.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27510/head:pull/27510

PR: https://git.openjdk.org/jdk/pull/27510