ISUB_R fix for ARM/RISC-V JIT (master)#326
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tevador
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SChernykh
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When `src = dst` and `imm = 0x80000000` in ISUB_R, the JIT generated the wrong code because negating 0x80000000 (-2^31) resulted in -2^31 again, not +2^31. Also added the test to `tests.cpp` to check this case (can be verified by disabling the fix in jit_compiler_a64/jit_compiler_rv64).
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See #325