RFR: 8359232: [PPC64] C2: Clean up ppc.ad: add instr sizes, remove comments [v2]

[David Briemann]

> Add missing sizes for some instructions.
> Clean up outdated Power7 comments.

David Briemann has updated the pull request incrementally with one additional commit since the last revision:

  re-add deleted token

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/25752/files
  - new: https://git.openjdk.org/jdk/pull/25752/files/b30892be..315a7da5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25752&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25752&range=00-01

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/25752.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25752/head:pull/25752

PR: https://git.openjdk.org/jdk/pull/25752