RFR: 8345678: compute_modifiers should not be in create_mirror [v4]

[Coleen Phillimore]

> This moves the modifier_flag computation to when InstanceKlass, ObjArrayKlass and TypeArrayKlass are created.
> 
> Tested with jck:vm and tier1-4.

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

  Removed comment about compute_modifiers().

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Changes:
  - all: https://git.openjdk.org/jdk/pull/22618/files
  - new: https://git.openjdk.org/jdk/pull/22618/files/a0792dff..ef393005

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22618&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22618&range=02-03

  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/22618.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22618/head:pull/22618

PR: https://git.openjdk.org/jdk/pull/22618