RFR: 8305671: javac rejects semicolons in compilation units with no imports

Wed Apr 5 18:45:15 UTC 2023

The fix for [JDK-8027682](https://bugs.openjdk.org/browse/JDK-8027682) created a new bug in which a program like this:

package p;;

would be rejected.

This is due to the previous fix swallowing all the semicolons. Instead, in the case of semicolons followed by EOF, it needs to swallow all but the last one.

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Commit messages:
 - Allow a package declaration followed (only) by multiple commas.

Changes: https://git.openjdk.org/jdk/pull/13361/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13361&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8305671
  Stats: 69 lines in 2 files changed: 67 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/13361.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13361/head:pull/13361

PR: https://git.openjdk.org/jdk/pull/13361