RFR: 8300012: Remove unused JDI VirtualMachineImpl.removeObjectMirror(ObjectReferenceImpl object) method [v2]

[Chris Plummer]

> `VirtualMachineImpl.removeObjectMirror(ObjectReferenceImpl object)` is not used. Furthermore it confuses the reader that runs across `removeObjectMirror()` calls, because what is actually being called is `removeObjectMirror(SoftObjectReference ref)`.

Chris Plummer has updated the pull request incrementally with one additional commit since the last revision:

  Make removeObjectMirror() private.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11957/files
  - new: https://git.openjdk.org/jdk/pull/11957/files/fa48e07c..dbd2f3d5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11957&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11957&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/11957.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11957/head:pull/11957

PR: https://git.openjdk.org/jdk/pull/11957