RFR: 8296161: [aarch64] Remove unused "pcrel" addressing mode tag [v2]

[Kim Barrett]

> Please review this trivial change to remove the unused Address::pcrel
> enumerator from the Address::mode enum.

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-pcrel
 - remove unused pcrel mode

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Changes:
  - all: https://git.openjdk.org/jdk/pull/10927/files
  - new: https://git.openjdk.org/jdk/pull/10927/files/48bf39a6..21004cc1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10927&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10927&range=00-01

  Stats: 9830 lines in 205 files changed: 7178 ins; 1732 del; 920 mod
  Patch: https://git.openjdk.org/jdk/pull/10927.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10927/head:pull/10927

PR: https://git.openjdk.org/jdk/pull/10927