LLVM 24 updates (in llvm/llvm-project@bff9c544bd87) the diagnostic string for the RISC-V GPR register class in MC. As a result, invalid register operand references (such as x16..=x31 on riscv32e targets) now emit "register must be a GPR" instead of "invalid operand for instruction". To keep the test passing on both LLVM <=23 and LLVM >=24, split the target revisions into versioned pairs (e.g. riscv32e_llvm23 and riscv32e_llvm24) gated by `max-llvm-major-version: 23` and `min-llvm-version: 24`, respectively, with corresponding stderr references. This is admittedly a bit aggressive - I'm also fine if we want to just set a max-llvm-major-version and ignore it or preemptively bump it for 24 and set the min version instead of this complexity.
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