Running jdk/incubator/vector/* tests with -XX:+AlwaysIncrementalInline triggers this.

#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/workspace/open/src/hotspot/share/prims/vectorSupport.cpp:595), pid=303804, tid=303825
# fatal error: unknown op: 108
#
# JRE version: Java(TM) SE Runtime Environment (26.0+14) (fastdebug build 26-ea+14-1366)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 26-ea+14-1366, mixed mode, sharing, compressed oops, compressed class ptrs, g1 gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0x1bfdbb2] VectorSupport::vop2ideal(int, BasicType)+0x42

Current CompileTask:
C2:2283 778 % b Float64VectorTests::ACOSFloat64VectorTests @ 50 (120 bytes)

Stack: [0x00007a30eb000000,0x00007a30eb100000], sp=0x00007a30eb0fa970, free space=1002k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x1bfdbb2] VectorSupport::vop2ideal(int, BasicType)+0x42 (vectorSupport.cpp:595)
V [libjvm.so+0x1bec57f] LibraryCallKit::inline_vector_nary_operation(int)+0x50f
V [libjvm.so+0x14f3790] LibraryIntrinsic::generate(JVMState*)+0x230
V [libjvm.so+0x9ab1c3] CallGenerator::do_late_inline_helper()+0xa63
V [libjvm.so+0xb78418] Compile::inline_incrementally_one()+0x1b8
V [libjvm.so+0xb796cb] Compile::inline_incrementally(PhaseIterGVN&)+0x38b
V [libjvm.so+0xb7c01e] Compile::Optimize()+0x47e
V [libjvm.so+0xb7f97f] Compile::Compile(ciEnv*, ciMethod*, int, Options, DirectiveSet*)+0x1f8f
V [libjvm.so+0x9a2076] C2Compiler::compile_method(ciEnv*, ciMethod*, int, bool, DirectiveSet*)+0x466
V [libjvm.so+0xb8ee68] CompileBroker::invoke_compiler_on_method(CompileTask*)+0xb48
V [libjvm.so+0xb90080] CompileBroker::compiler_thread_loop()+0x5c0
V [libjvm.so+0x10f07cb] JavaThread::thread_main_inner()+0x13b
V [libjvm.so+0x1b63056] Thread::call_run()+0xb6
V [libjvm.so+0x17d7098] thread_native_entry(Thread*)+0x128