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

[Luís Marques via llvm-commits]

luismarques wrote:

> Will we be able to get this in for LLVM 19 branch next week? Looks like we previously had an LGTM from @vitalybuka. @luismarques were you able to test it?

I can run the tests in my setup when I'm back on Wednesday but it's probably fine to merge this.

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