RFR: 8267921: Remove redundant loop from sun.reflect.misc.ReflectUtil.privateCheckPackageAccess()

[Сергей Цыпанов]

This a tiny follop-up of https://github.com/openjdk/jdk/pull/3571.

The loop in `sun.reflect.misc.ReflectUtil.privateCheckPackageAccess()` is redundant since `Class.getPackageName()` will already return the package name of the innermost component type.

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Commit messages:
 - 8267921: Remove redundant loop from sun.reflect.misc.ReflectUtil.privateCheckPackageAccess()

Changes: https://git.openjdk.java.net/jdk/pull/4268/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4268&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8267921
  Stats: 4 lines in 1 file changed: 0 ins; 4 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4268.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4268/head:pull/4268

PR: https://git.openjdk.java.net/jdk/pull/4268