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

[Florian Mayer via llvm-commits]

fmayer 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.

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