RFR: 8272107: Removal of Unsafe::defineAnonymousClass left a dangling C++ class [v4]

[Harold Seigel]

> Please review this change to remove the now unused CPSlot class.  Uses of CPSlot have been replaced with Symbol*.  The change was tested by running JCK lang and VM tests, Mach5 tiers 1-2 on Linux, Mac OS, and WIndows and Macn5 tiers 3-5 on Linux x64.
> 
> Thanks, Harold

Harold Seigel has updated the pull request incrementally with one additional commit since the last revision:

  remove load_symbol(), fix comments

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5070/files
  - new: https://git.openjdk.java.net/jdk/pull/5070/files/42afa811..383a02a7

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5070&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5070&range=02-03

  Stats: 12 lines in 4 files changed: 3 ins; 7 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5070.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5070/head:pull/5070

PR: https://git.openjdk.java.net/jdk/pull/5070