RFR: 8336267: Method and Constructor signature parsing can be shared on the root object [v4]

[Chen Liang]

> A straightforward optimization, to share the signature parsing of method, constructor, and field between the root and the copied objects, like how method handle accessors are shared.

Chen Liang has updated the pull request incrementally with one additional commit since the last revision:

  Missed field

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Changes:
  - all: https://git.openjdk.org/jdk/pull/20179/files
  - new: https://git.openjdk.org/jdk/pull/20179/files/8147d665..5ff5797a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20179&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20179&range=02-03

  Stats: 21 lines in 1 file changed: 0 ins; 8 del; 13 mod
  Patch: https://git.openjdk.org/jdk/pull/20179.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20179/head:pull/20179

PR: https://git.openjdk.org/jdk/pull/20179