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

[Michael Maitland via cfe-commits]

michaelmaitland 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?

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