RFR: 7945: Avoid throwing NoSuchFieldException in ValueReaders$ReflectiveReader

[Richard Startin]

When using jmc-common in a backend process we throw the following swallowed exception millions of times a day:


java.lang.NoSuchFieldException: package
	at java.base/java.lang.Class.getField(Class.java:2149)
	at org.openjdk.jmc.flightrecorder.internal.parser.v1.ValueReaders$ReflectiveReader.addField(ValueReaders.java:593)
	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager$TypeEntry.getReader(TypeManager.java:200)
	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager.createFieldReader(TypeManager.java:493)
	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager.access$000(TypeManager.java:86)
	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager$TypeEntry.getReader(TypeManager.java:198)
	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager.createFieldReader(TypeManager.java:493)
	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager.access$000(TypeManager.java:86)
	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager$TypeEntry.getReader(TypeManager.java:198)
	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager.createFieldReader(TypeManager.java:493)
	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager.access$000(TypeManager.java:86)
	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager$TypeEntry.getReader(TypeManager.java:198)
	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager.createFieldReader(TypeManager.java:493)
	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager.access$000(TypeManager.java:86)
	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager$EventTypeEntry.init(TypeManager.java:357)
	at org.openjdk.jmc.flightrecorder.internal.parser.v1.TypeManager.<init>(TypeManager.java:432)
	at org.openjdk.jmc.flightrecorder.internal.parser.v1.ChunkLoaderV1.call(ChunkLoaderV1.java:70)
	at org.openjdk.jmc.flightrecorder.internal.parser.v1.ChunkLoaderV1.call(ChunkLoaderV1.java:48)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.lang.Thread.run(Thread.java:833)


This adds a simple memoization to store the identifier to field mapping, with size bounded by the number of classes used in JFR events.
---------
### Progress
- [ ] Commit message must refer to an issue
- [ ] Change must be properly reviewed (1 review required, with at least 1 [Committer](https://openjdk.org/bylaws#committer))

### Error
 ⚠️ The pull request body must not be empty.

### Reviewing
<details><summary>Using <code>git</code></summary>

Checkout this PR locally: \
`$ git fetch https://git.openjdk.org/jmc pull/447/head:pull/447` \
`$ git checkout pull/447`

Update a local copy of the PR: \
`$ git checkout pull/447` \
`$ git pull https://git.openjdk.org/jmc pull/447/head`

</details>
<details><summary>Using Skara CLI tools</summary>

Checkout this PR locally: \
`$ git pr checkout 447`

View PR using the GUI difftool: \
`$ git pr show -t 447`

</details>
<details><summary>Using diff file</summary>

Download this PR as a diff file: \
<a href="https://git.openjdk.org/jmc/pull/447.diff">https://git.openjdk.org/jmc/pull/447.diff</a>

</details>

-------------

Commit messages:
 - 7945: Avoid throwing NoSuchFieldException in ValueReaders$ReflectiveReader

Changes: https://git.openjdk.org/jmc/pull/447/files
 Webrev: https://webrevs.openjdk.org/?repo=jmc&pr=447&range=00
  Issue: https://bugs.openjdk.org/browse/JMC-7945
  Stats: 29 lines in 1 file changed: 21 ins; 3 del; 5 mod
  Patch: https://git.openjdk.org/jmc/pull/447.diff
  Fetch: git fetch https://git.openjdk.org/jmc pull/447/head:pull/447

PR: https://git.openjdk.org/jmc/pull/447