fix(riscv): decode HLVX.WU on RV32 with H extension

[carlosqwqqwq]

Summary

HLVX.WU is valid on both RV32 and RV64 with the H extension, but decode_hypervisor_mem gates the (0x34, 3, _) arm with if rv64, rejecting the legal RV32 encoding as Op::Illegal. This change removes the gate so the encoding decodes on RV32 as well.

Validation

• New regression test: hlvx_wu_valid_on_rv32_with_h — RV32+H decodes to Op::HlvxWu, RV64 decodes to Op::HlvxWu, and no-H stays illegal.
• cargo test --lib targeted test passes; full suite shows no regressions.

Closes #299

[19h]

Thank you for the report and implementation proposal. I independently reproduced and validated the accepted behavior, then reimplemented it with direct and SMIR/JIT coverage in #296 at commit 9027ae1. No contributor patch was imported; the consolidation commit records @carlosqwqqwq as co-author. I am closing this implementation PR because it is now consolidated into #296. Please review the rollup there.