[jdk17u-dev] RFR: 8300260: Remove metaprogramming/isSame.hpp

[George Adams]

Applies cleanly other than `src/hotspot/share/utilities/devirtualizer.inline.hpp` already being deleted in 17u-dev

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

Commit messages:
 - Backport c8dd7583a92082bcd2a4dfd5429889e7f0a44050

Changes: https://git.openjdk.org/jdk17u-dev/pull/2692/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2692&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8300260
  Stats: 98 lines in 6 files changed: 0 ins; 93 del; 5 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2692.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2692/head:pull/2692

PR: https://git.openjdk.org/jdk17u-dev/pull/2692