RFR: 8312232: Remove sun.jvm.hotspot.runtime.VM.buildLongFromIntsPD()

[Chris Plummer]

VM.buildLongFromIntsPD() is not longer used. Remove it.

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Commit messages:
 - Get rid of VM.buildLongFromIntsPD()

Changes: https://git.openjdk.org/jdk/pull/15371/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15371&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8312232
  Stats: 21 lines in 2 files changed: 3 ins; 13 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/15371.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15371/head:pull/15371

PR: https://git.openjdk.org/jdk/pull/15371