[Committed] RISC-V: Move vector-abi testcases into rvv/base folder

[Patrick O'Neill]

On 8/24/23 11:28, Palmer Dabbelt wrote:

Reviewed-by: Palmer Dabbelt <pal...@rivosinc.com>

I think Joern is still looking into fixing up all these explicit ISA strings in the tests, but I don't see any reason to block fixing failing tests on that.

Thanks!

Committed

Patrick