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

[Florian Mayer via llvm-commits]

fmayer wrote:

> SANITIZER_CAN_USE_PREINIT_ARRAY



> @fmayer Can you please check the [8b6c034](https://github.com/llvm/llvm-project/commit/8b6c0349b8885e5183d51d98c6d30927b978e842) ?

Works

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