RFR: 8359707: Add classfile modification code to RedefineClassHelper [v8]

[Coleen Phillimore]

> I copied this code for another test in the Valhalla repo and thought it would be a good utility function.  It might be better written using the Classfile API.
> Tested with test.

Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:

  Rename replaceAllStrings to replaceClassName and add back the byte buffer version of the function.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/25857/files
  - new: https://git.openjdk.org/jdk/pull/25857/files/21223e37..17b3b77b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25857&range=07
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25857&range=06-07

  Stats: 18 lines in 2 files changed: 13 ins; 1 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/25857.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25857/head:pull/25857

PR: https://git.openjdk.org/jdk/pull/25857