RISC-V JITCrossPlatformsOpCodesTest.CompareTest fails w/ Exception: Illegal

[0xdaryl]

RISC-V CI testing has begun to fail Oct 6, 2025:

15:14:34  26: [----------] 7 tests from JITCrossPlatformsOpCodesTest
15:14:34  26: [ RUN      ] JITCrossPlatformsOpCodesTest.UnaryTest
15:14:34  26: [       OK ] JITCrossPlatformsOpCodesTest.UnaryTest (141 ms)
15:14:34  26: [ RUN      ] JITCrossPlatformsOpCodesTest.IntegerArithmeticTest
15:14:34  26: [       OK ] JITCrossPlatformsOpCodesTest.IntegerArithmeticTest (186 ms)
15:14:34  26: [ RUN      ] JITCrossPlatformsOpCodesTest.MemoryOperationTest
15:14:34  26: [       OK ] JITCrossPlatformsOpCodesTest.MemoryOperationTest (33 ms)
15:14:34  26: [ RUN      ] JITCrossPlatformsOpCodesTest.BitwiseTest
15:14:34  26: [       OK ] JITCrossPlatformsOpCodesTest.BitwiseTest (65 ms)
15:14:34  26: [ RUN      ] JITCrossPlatformsOpCodesTest.CompareTest
15:14:34  26/29 Test #26: CompilerTest ......................***Exception: Illegal 50.15 sec
15:14:34  test 27

This exception is occurring even on PRs where RISC-V CI testing passed previously.

It is unclear whether this is an actual issue that was exposed recently, or a change to the RISC-V CI nodes.

This failure is only seen on RISC-V.