[lilliput-jdk17u:lilliput] RFR: 8304329: [Lilliput/JDK17] Fix DiagnoseSyncOnValueBasedClasses

[Roman Kennke]

Some deeper testing shows that the following test is currently failing in Lilliput/JDK17:

java/net/httpclient/LineBodyHandlerTest.java

That is caused by that test using DiagnoseSyncOnValueBasedClasses, and that seems currently broken with Lilliput/JDK17 because it sets a plain prototype header on a class, where it should also set the narrow Klass* in the prototype.

Testing:
 - [x] java/net/httpclient/LineBodyHandlerTest.java
 - [x] tier1

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Commit messages:
 - 8304329: [Lilliput/JDK17] Fix DiagnoseSyncOnValueBasedClasses

Changes: https://git.openjdk.org/lilliput-jdk17u/pull/11/files
 Webrev: https://webrevs.openjdk.org/?repo=lilliput-jdk17u&pr=11&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8304329
  Stats: 5 lines in 1 file changed: 4 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/lilliput-jdk17u/pull/11.diff
  Fetch: git fetch https://git.openjdk.org/lilliput-jdk17u pull/11/head:pull/11

PR: https://git.openjdk.org/lilliput-jdk17u/pull/11