[llvm] [RISCV] Implement RISCVTTIImpl::getPreferredAddressingMode for HasVendorXCVmem (PR #120533)

[Philipp van Kempen via llvm-commits]

PhilippvK wrote:

> > @wangpc-pp Can this be merged?
> 
> Happy to go forward.

I do not have sufficient rights to perform the merge by myself. Could you please do a squash & merge @wangpc-pp?

https://github.com/llvm/llvm-project/pull/120533