[clang] [llvm] [RISCV] Add support for RISC-V Pointer Masking (PR #79929)

[Jesse Huang via cfe-commits]

jaidTw wrote:

> > Should you also update the riscv32-toolchain-extra.c and riscv64-toolchain-extra.c?
> 
> It is not immediately obvious to me what you had in mind for changing those tests. Could you please clarify?

I found I messed up the configuration so there were some test errors on my end. It works after I fixed it, never mind

https://github.com/llvm/llvm-project/pull/79929