[vectorIntrinsics] RFR: 8261484: Double64VectorTests.java crashes on x86

[Xiaohong Gong]

The crash is introduced by [1] and happens when the compiler is making an unspported vector type:
  assert(Matcher::vector_size_supported(elem_bt, length)) failed: length in range
Before vectorization for each vector intrinsic, the hotspot will check whether current arch supports the vector operation from several aspects like the backend implementation, the vector type and length. Once one of them is not matched, the compiler will stop the vectorization and go back to the default java implementation.

The changes in [1] missed the check for "Op_CallLeafVector". I think the double 64-bits vector is not supported to be vectorized. However, due to the missing check, the compiler continues the progress and then the crash happens.

This patch fixes it by making sure the check contains all opcodes.

[1] https://bugs.openjdk.java.net/browse/JDK-8261267

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Commit messages:
 - 8261484: Double64VectorTests.java crashes on x86

Changes: https://git.openjdk.java.net/panama-vector/pull/38/files
 Webrev: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=38&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261484
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/38.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/38/head:pull/38

PR: https://git.openjdk.java.net/panama-vector/pull/38