[lld] [llvm] [RISCV] Do not re-validate target ABI in AsmParser if already resolved by streamer (PR #223606)

[Ralf Jung via llvm-commits]

RalfJung wrote:

I don't know those details in our backend.
Cc @nikic @Amanieu 

https://github.com/llvm/llvm-project/pull/223606