Bug ID: JDK-8353175 Eliminate double iteration of stream in FieldDescriptor reinitialization

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JDK 21	JDK 25
21.0.10Fixed	25 b19Fixed

This is a partial fix for performance regression covered in JDK-8352075

Since FieldDescriptor::reinitialize() looks up FieldInfo calling InstanceKlass::field(int). After JDK-8292818 this requires an iteration through all class fields while the information is in many cases readily available.

[jdk21u-fix-request] Approval Request from Radim Vansa Partially fixes performance regression introduced in 21
05-08-2025
A pull request was submitted for review. Branch: master URL: https://git.openjdk.org/jdk21u-dev/pull/2010 Date: 2025-07-22 15:15:13 +0000
22-07-2025
Changeset: f169fc5a Branch: master Author: Radim Vansa <rvansa@openjdk.org> Committer: Johan Sjölen <jsjolen@openjdk.org> Date: 2025-04-14 08:18:59 +0000 URL: https://git.openjdk.org/jdk/commit/f169fc5a99ee2b485e156c043134ab76b7e5ebd9
14-04-2025
RT Triage: Copying triage of this issue from JDK-8352075 ILW=MMH=P3 Impact: Performance degradation, not a crash Likelihood: Possible existing generators for this many fields Workaround: User doesn't usually have control over these generators
28-03-2025
A pull request was submitted for review. Branch: master URL: https://git.openjdk.org/jdk/pull/24290 Date: 2025-03-28 11:03:29 +0000
28-03-2025
Attached CCC.java (reproducer) from the related issue, courtesy of [~shade]
28-03-2025