Reflection is not retrieving generic type information for mandated parameters. 
This is a known issue which has been explicitly stated in the API of some 
reflection methods. Fix for 
[JDK-8292275](https://bugs.openjdk.org/browse/JDK-8292275) made the parameters 
of compact constructors of record classes `mandated` as specified in the spec. 
But this implied that users that previous to this change could retrieve the 
generic type of parameters of compact constructors now they can't anymore. The 
proposed fix is to try to retrieve generic type information for mandated 
parameters if available plus changing the spec of the related reflection 
methods.

TIA

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Commit messages:
 - 8320575: generic type information lost on mandated parameters

Changes: https://git.openjdk.org/jdk/pull/17070/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17070&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8320575
  Stats: 45 lines in 2 files changed: 28 ins; 3 del; 14 mod
  Patch: https://git.openjdk.org/jdk/pull/17070.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17070/head:pull/17070

PR: https://git.openjdk.org/jdk/pull/17070

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