RFR: JDK-8299395: Remove metaprogramming/removeCV.hpp

[Justin King]

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

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Commit messages:
 - Remove metaprogramming/removeCV.hpp

Changes: https://git.openjdk.org/jdk/pull/11799/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11799&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8299395
  Stats: 64 lines in 5 files changed: 5 ins; 52 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/11799.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11799/head:pull/11799

PR: https://git.openjdk.org/jdk/pull/11799