RFR: JDK-8299402: Remove metaprogramming/isVolatile.hpp

[Justin King]

Code cleanup of pre-C++11 <type_traits> implementations.

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

Commit messages:
 - Remove related test
 - Remove metaprogramming/isVolatile.hpp

Changes: https://git.openjdk.org/jdk/pull/11801/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11801&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8299402
  Stats: 83 lines in 3 files changed: 1 ins; 80 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/11801.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11801/head:pull/11801

PR: https://git.openjdk.org/jdk/pull/11801