[llvm] [RISCV][sanitizer] Fix sanitizer support for different virtual memory layout (PR #66743)

[Luís Marques via llvm-commits]

luismarques wrote:

> I'll review this later today

Actually, if you're not in a big hurry to merge this please give me a couple of days to run some tests (they take a while).

https://github.com/llvm/llvm-project/pull/66743