RFR: 8297310: Remove unimplemented HeapInspection::iterate_over_heap [v2]

[Kim Barrett]

> Please review this trivial change to remove a function declaration that is never defined.

Kim Barrett has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'master' into remove_iterate_over_heap
 - remove decl

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11280/files
  - new: https://git.openjdk.org/jdk/pull/11280/files/71cabf0c..6072ca4a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11280&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11280&range=00-01

  Stats: 1895 lines in 56 files changed: 752 ins; 913 del; 230 mod
  Patch: https://git.openjdk.org/jdk/pull/11280.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11280/head:pull/11280

PR: https://git.openjdk.org/jdk/pull/11280