RFR: 8272107: Removal of Unsafe::defineAnonymousClass left a dangling C++ class [v3]

[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:

  add comment for unresolved_string_at_put()

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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/324677d2..42afa811

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5070&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5070&range=01-02

  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 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