RFR: 8344144: AES/CBC slow at big payloads

[Volodymyr Paprotski]

Measuring throughput with JMH parameters `-f 1 -i 2 -wi 3 -r 20 -w 30  -p algorithm=AES/CBC/NoPadding -p dataSize=30000000 -p provider=SunJCE -p keyLength=128 org.openjdk.bench.javax.crypto.full.AESBench`

Before:

Benchmark                (algorithm)  (dataSize)  (keyLength)  (provider)   Mode  Cnt   Score   Error  Units
AESBench.decrypt   AES/CBC/NoPadding    30000000          128      SunJCE  thrpt    2  25.383          ops/s
AESBench.decrypt2  AES/CBC/NoPadding    30000000          128      SunJCE  thrpt    2  32.230          ops/s
AESBench.encrypt   AES/CBC/NoPadding    30000000          128      SunJCE  thrpt    2  20.489          ops/s
AESBench.encrypt2  AES/CBC/NoPadding    30000000          128      SunJCE  thrpt    2  21.383          ops/s


After:

Benchmark                (algorithm)  (dataSize)  (keyLength)  (provider)   Mode  Cnt    Score   Error  Units
AESBench.decrypt   AES/CBC/NoPadding    30000000          128      SunJCE  thrpt    2  215.144          ops/s
AESBench.decrypt2  AES/CBC/NoPadding    30000000          128      SunJCE  thrpt    2  411.265          ops/s
AESBench.encrypt   AES/CBC/NoPadding    30000000          128      SunJCE  thrpt    2   64.341          ops/s
AESBench.encrypt2  AES/CBC/NoPadding    30000000          128      SunJCE  thrpt    2   73.114          ops/s


I have not deterministically proven why chunking works: before the change, the CBC intrinsic is not being used; and after chunking, it is. There is quite a bit of GC activity in the default AESBench, so `encrypt2/decrypt2` versions isolate just crypto (see comment below).

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Commit messages:
 - chunk cbc intrinsic

Changes: https://git.openjdk.org/jdk/pull/22086/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22086&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344144
  Stats: 27 lines in 1 file changed: 24 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/22086.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22086/head:pull/22086

PR: https://git.openjdk.org/jdk/pull/22086