Bug ID: JDK-8361532 RISC-V: Several vector tests fail after JDK-8354383

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JDK 26
26Unresolved

RISC-V: Several vector tests fail after JDK-8354383

Hi all,
Please take a look and review this PR, thanks!

After JDK-8354383, the following test cases fail when fastdebug with rvv:
jdk/incubator/vector/Byte128VectorLoadStoreTests.java 
jdk/incubator/vector/Byte256VectorLoadStoreTests.java 
jdk/incubator/vector/Byte64VectorLoadStoreTests.java 
jdk/incubator/vector/ByteMaxVectorLoadStoreTests.java 
jdk/incubator/vector/Double128VectorLoadStoreTests.java 
jdk/incubator/vector/Double256VectorLoadStoreTests.java 
jdk/incubator/vector/DoubleMaxVectorLoadStoreTests.java 
jdk/incubator/vector/Float128VectorLoadStoreTests.java 
jdk/incubator/vector/Float256VectorLoadStoreTests.java 
jdk/incubator/vector/Float64VectorLoadStoreTests.java 
jdk/incubator/vector/FloatMaxVectorLoadStoreTests.java 
jdk/incubator/vector/Short128VectorLoadStoreTests.java 
jdk/incubator/vector/Short256VectorLoadStoreTests.java 
jdk/incubator/vector/Short64VectorLoadStoreTests.java 
jdk/incubator/vector/ShortMaxVectorLoadStoreTests.java

The error log is as follows:
o531  CastVV  === o726 o751  [[ o530 ]]  #vectormask<B,8> unconditional dependency

--N: o531  CastVV  === o726 o751  [[ o530 ]]  #vectormask<B,8> unconditional dependency

   --N: o751  Phi  === o726 o539 o293  [[ o531 ]]  #vectormask<B,8>
   VREGMASK  0  VREGMASK
   VREGMASK_V0  0  VREGMASK_V0

#
# A fatal error has been detected by the Java Runtime Environment:
#
#  Internal Error (/home/zhangdingli/jdk/src/hotspot/share/opto/matcher.cpp:1765), pid=1692890, tid=1693070
#  assert(false) failed: bad AD file
#
# JRE version: OpenJDK Runtime Environment (26.0) (fastdebug build 26-internal-adhoc.zhangdingli.jdk)
# Java VM: OpenJDK 64-Bit Server VM (fastdebug 26-internal-adhoc.zhangdingli.jdk, mixed mode, compressed oops, compressed class ptrs, g1 gc, linux-riscv64)
# Problematic frame:
# V  [libjvm.so+0x10fdfd0]  Matcher::Label_Root(Node const*, State*, Node*, Node*&)+0x680
#
# Core dump will be written. Default location: Core dumps may be processed with "/usr/lib/systemd/systemd-coredump %P %u %g %s %t %c %h" (or dumping to /home/zhangdingli/jdk/jtreg_0708/JTwork/scratch/0/core.1692890)
#
# An error report file with more information is saved as:

The reason for the error is that riscv lacks CastVV with dst as the mask register.