RFR: 8366971: C2: Remove unused nop_list from PhaseOutput::init_buffer [v2]

[Daniel Jeliński]

> The nop list has never been used in the history of OpenJDK. Let's clean it up.
> 
> Tested with Mach5 tier 1-5, no related failures.

Daniel Jeliński has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains four commits:

 - Merge remote-tracking branch 'origin/master' into nops-cleanup
 - Update copyright
 - Remove outdated comment
 - Remove nop list

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Changes: https://git.openjdk.org/jdk/pull/27117/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27117&range=01
  Stats: 83 lines in 11 files changed: 1 ins; 77 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/27117.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27117/head:pull/27117

PR: https://git.openjdk.org/jdk/pull/27117