RFR: 8261522: [PPC64] AES intrinsics write beyond the destination array [v2]

[Martin Doerr]

> I'd like to replace the read-modify-write implementation from aescrypt_encryptBlock / aescrypt_decryptBlock stubs. It can cause severe problems (see bug description).

Martin Doerr has updated the pull request incrementally with one additional commit since the last revision:

  Add comment and key length assertions. Minor improvement.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2514/files
  - new: https://git.openjdk.java.net/jdk/pull/2514/files/d933c2f7..725dd8c7

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2514&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2514&range=00-01

  Stats: 42 lines in 1 file changed: 26 ins; 8 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2514.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2514/head:pull/2514

PR: https://git.openjdk.java.net/jdk/pull/2514