[clang] [WIP] For Asan instrumented global, emit two symbols, one with actual size and other with instrumented size. (PR #70166)

[Vitaly Buka via cfe-commits]

vitalybuka wrote:

Would it be possible to create an issue, or RFC explain in one place what it the problem you are trying to solve and how?

https://github.com/llvm/llvm-project/pull/70166