[compiler-rt] Reland '[hwasan] Add fixed_shadow_base flag (#73980)' (PR #95445)

[Vitaly Buka via llvm-commits]

vitalybuka wrote:

> Now also on the correct PR:
> 
> I think that's incorrect:
> 
> ```
> #ifndef SANITIZER_CAN_USE_PREINIT_ARRAY
> #if (SANITIZER_LINUX || SANITIZER_FUCHSIA || SANITIZER_NETBSD) && !defined(PIC)
> #define SANITIZER_CAN_USE_PREINIT_ARRAY 1
> // Before Solaris 11.4, .preinit_array is fully supported only with GNU ld.
> // FIXME: Check for those conditions.
> ```
> 
> ANDROID is Linux and does in fact _support_ preinit array, we just don't use it for HWASan.

I believe it's disabled because hwasan is dynamic lib.
Either way this patch is correct for the current state of the code.

https://github.com/llvm/llvm-project/pull/95445