RFR: 8283008: KRegister documentation out of date [v2]

[Thomas Schatzl]

> Hi all,
> 
>   can I have reviews for this cleanup of `KRegister(Impl)` documentation, currently being a mix of copy&paste from `XMMRegister` and obsolete MMX support.
> 
> Testing: local compilation
> 
> Thanks,
>   Thomas

Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:

  Fix copyright

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7784/files
  - new: https://git.openjdk.java.net/jdk/pull/7784/files/4ea657d2..1e4a8c95

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7784&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7784&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7784.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7784/head:pull/7784

PR: https://git.openjdk.java.net/jdk/pull/7784