8320794: Emulate rest of vblendvp[sd] on ECore

[vpaprotsk]

Replace vpblendvp[sd] with macro assembler call and test in:

• C2_MacroAssembler::vector_cast_float_to_int_special_cases_avx (insufficient registers for 1 of 2 blends)
• C2_MacroAssembler::vector_cast_double_to_int_special_cases_avx
• C2_MacroAssembler::vector_count_leading_zeros_int_avx

Functional testing with existing and new tests: make test TEST="test/hotspot/jtreg/compiler/vectorapi/reshape test/hotspot/jtreg/compiler/vectorization/runner/BasicIntOpTest.java"

Benchmarking with existing and new tests: make test TEST="micro:org.openjdk.bench.jdk.incubator.vector.VectorFPtoIntCastOperations"

Performance before:

Benchmark                                               (SIZE)   Mode  Cnt      Score     Error   Units
VectorFPtoIntCastOperations.microDouble256ToInteger256     512  thrpt    5  17514.335 ± 145.342  ops/ms
VectorFPtoIntCastOperations.microDouble256ToInteger256    1024  thrpt    5   9525.645 ±  72.152  ops/ms
VectorFPtoIntCastOperations.microFloat256ToInteger256      512  thrpt    5  11684.992 ±  10.260  ops/ms
VectorFPtoIntCastOperations.microFloat256ToInteger256     1024  thrpt    5   6001.282 ±   7.813  ops/ms
VectorBitCount.WithSuperword.intLeadingZeroCount    1024       0  avgt    4  1002.290 ± 1.959  ns/op

Performance after:

Benchmark                                               (SIZE)   Mode  Cnt      Score     Error   Units
VectorFPtoIntCastOperations.microDouble256ToInteger256     512  thrpt    5  18241.190 ± 115.320  ops/ms
VectorFPtoIntCastOperations.microDouble256ToInteger256    1024  thrpt    5   9233.245 ± 123.493  ops/ms
VectorFPtoIntCastOperations.microFloat256ToInteger256      512  thrpt    5  11682.371 ±   5.806  ops/ms
VectorFPtoIntCastOperations.microFloat256ToInteger256     1024  thrpt    5   6006.308 ±   2.190  ops/ms
VectorBitCount.WithSuperword.intLeadingZeroCount    1024       0  avgt    4  957.081 ± 4.049  ns/op

---

Progress

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Issue

• JDK-8320794: Emulate rest of vblendvp[sd] on ECore (Enhancement - P4)

Reviewing

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https://git.openjdk.org/jdk/pull/18310.diff

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Webrevs

• 03: Full - Incremental (0d3feee9)
• 02: Full - Incremental (1705a6aa)
• 01: Full - Incremental (9430d88e)
• 00: Full (af21bfc4)

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