[clang] [Driver,sanitizer] Remove RequiresPIE and msan's NeedPIE setting (PR #77689)

[Andy Kaylor via cfe-commits]

andykaylor wrote:

@MaskRay I see that in 3bbc912d37f03d9ad3be330b81d91c2eaf6c37f2 you removed some tests that fail because of this change. Why do you think that is an appropriate solution? I have some other tests in a downstream product that are failing because we build with CLANG_DEFAULT_PIE_ON_LINUX=OFF. You said in your initial comment here that "most builds set CLANG_DEFAULT_PIE_ON_LINUX to 1, making RequiresPIE/NeedPIE redundant on Linux." But apparently it's not redundant for builds that don't use that setting.

Do you have another solution in progress (or already committed that I haven't seen yet)? It seems that as long as this is a configurable option, we need to support both settings. Intel's SYCL project (https://github.com/intel/llvm) currently sets CLANG_DEFAULT_PIE_ON_LINUX to zero for compatibility with gcc in Fedora releases (at least, I think that's the reason).

https://github.com/llvm/llvm-project/pull/77689