[jdk11u-dev] RFR: 8302791: Add specific ClassLoader object to Proxy IllegalArgumentException message

[Ravali Yatham]

Added specific class loader object to proxy IllegalArgumentException from which the class was not visible

The bug report for the same: https://bugs.openjdk.org/browse/JDK-8302791

OpenJDK PR: https://github.com/openjdk/jdk/pull/12641

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Commit messages:
 - Backport 9f9d678591e02ecaeae7b81eeefb0ba41c7b4dae

Changes: https://git.openjdk.org/jdk11u-dev/pull/1802/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1802&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8302791
  Stats: 18 lines in 4 files changed: 17 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1802.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1802/head:pull/1802

PR: https://git.openjdk.org/jdk11u-dev/pull/1802