[jdk17] RFR: JDK-8269351: Proxy::newProxyInstance and MethodHandleProxies::asInterfaceInstance should reject sealed interfaces

[Mandy Chung]

`java.lang.reflect.Proxy::newProxyInstance` and `java.lang.invoke.MethodHandleProxies::asInterfaceInstance` do not specify how to deal with sealed interfaces.  These APIs should reject  sealed interface with `IllegalArgumentException` which is thrown if the given interface is invalid.

Please review CSR:
    https://bugs.openjdk.java.net/browse/JDK-8269396

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Commit messages:
 - JDK-8269351: Proxy.newProxyInstance and MethodHandleProxies::asInterfaceInstance should reject sealed interfaces

Changes: https://git.openjdk.java.net/jdk17/pull/148/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17&pr=148&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8269351
  Stats: 101 lines in 4 files changed: 97 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk17/pull/148.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17 pull/148/head:pull/148

PR: https://git.openjdk.java.net/jdk17/pull/148