RFR: 8296162: [aarch64] Remove unused Address::_is_lval [v2]

[Kim Barrett]

> Please review this trivial change to remove the unused Address::_is_lval member.

Kim Barrett has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'master' into remove-is-lval
 - remove unused _is_lval

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Changes:
  - all: https://git.openjdk.org/jdk/pull/10928/files
  - new: https://git.openjdk.org/jdk/pull/10928/files/9b2d7f4f..97030437

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10928&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10928&range=00-01

  Stats: 9831 lines in 206 files changed: 7178 ins; 1732 del; 921 mod
  Patch: https://git.openjdk.org/jdk/pull/10928.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10928/head:pull/10928

PR: https://git.openjdk.org/jdk/pull/10928