[jdk17u-dev] RFR: 8300264: Remove metaprogramming/isPointer.hpp

[George Adams]

Prerequisite to bumping gtest, applies cleanly

-------------

Depends on: https://git.openjdk.org/jdk17u-dev/pull/2690

Commit messages:
 - Backport eba87a0ee0410f61ae764293986ecc162f48c707

Changes: https://git.openjdk.org/jdk17u-dev/pull/2691/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2691&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8300264
  Stats: 106 lines in 5 files changed: 2 ins; 95 del; 9 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2691.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2691/head:pull/2691

PR: https://git.openjdk.org/jdk17u-dev/pull/2691