RFR: 8357982: Fix several failing BMI tests with -XX:+UseAPX

[Jatin Bhateja]

A) Patch extends the following tests with hard-coded encoding checks for various BMI instructions to cover REX2 or extended EVEX encodings supported by APX. 


     compiler/intrinsics/bmi/verifycode/AndnTestI.java
     compiler/intrinsics/bmi/verifycode/AndnTestL.java
     compiler/intrinsics/bmi/verifycode/BzhiTestI2L.java
     compiler/intrinsics/bmi/verifycode/LZcntTestL.java
     compiler/intrinsics/bmi/verifycode/TZcntTestL.java


B) After integration of JDK-8349582, which added APX NDD support, AndN instruction selection patterns that expect (Xor SRC, -1) as one of its operands were not getting selected because of a lower-cost generic immediate pattern match; patch fixes this issue through strict predicate checks.

Above tests are now passing, validations were carried out using Intel Software Development emulator.

Kindly review and share your feedback.

Best Regards,
Jatin

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Commit messages:
 - 8357982: Fix several failing BMI tests with -XX:+UseAPX

Changes: https://git.openjdk.org/jdk/pull/25501/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25501&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8357982
  Stats: 62 lines in 6 files changed: 48 ins; 0 del; 14 mod
  Patch: https://git.openjdk.org/jdk/pull/25501.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25501/head:pull/25501

PR: https://git.openjdk.org/jdk/pull/25501