RFR: 8353175: Eliminate double iteration of stream in FieldDescriptor reinitialization

[Radim Vansa]

On the reproducer https://bugs.openjdk.org/secure/attachment/113985/CCC.java my local testing shows these numbers:

### JDK-17

$ hyperfine -w 5 -r 10 '/path/to/jdk-17/bin/java -cp /tmp/ CCC'
Benchmark 1: /path/to/jdk-17/bin/java -cp /tmp/ CCC
  Time (mean ± σ):      32.5 ms ±   0.9 ms    [User: 27.5 ms, System: 10.6 ms]
  Range (min … max):    31.1 ms …  33.7 ms    10 runs

### JDK-25 before the change applied

$ hyperfine -w 5 -r 10 '/path/to/jdk-25/build/linux-x86_64-server-release/images/jdk/bin/java -cp /tmp/ CCC'
Benchmark 1: /path/to/jdk-25/build/linux-x86_64-server-release/images/jdk/bin/java -cp /tmp/ CCC
  Time (mean ± σ):     101.6 ms ±   1.5 ms    [User: 96.8 ms, System: 14.6 ms]
  Range (min … max):    99.0 ms … 104.5 ms    10 runs

### JDK-25 with this patch

$ hyperfine -w 5 -r 10 '/path/to/jdk-25/build/linux-x86_64-server-release/images/jdk/bin/java -cp /tmp/ CCC'
Benchmark 1: /path/to/jdk-25/build/linux-x86_64-server-release/images/jdk/bin/java -cp /tmp/ CCC
  Time (mean ± σ):      75.8 ms ±   1.2 ms    [User: 69.8 ms, System: 16.0 ms]
  Range (min … max):    73.8 ms …  78.2 ms    10 runs

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Commit messages:
 - 8353175: Eliminate double iteration of stream in FieldDescriptor reinitialization

Changes: https://git.openjdk.org/jdk/pull/24290/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24290&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8353175
  Stats: 20 lines in 6 files changed: 2 ins; 3 del; 15 mod
  Patch: https://git.openjdk.org/jdk/pull/24290.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24290/head:pull/24290

PR: https://git.openjdk.org/jdk/pull/24290