[compiler-rt] [hwasan] Report unavalible fixed shadow range (PR #98574)

[Thurston Dang via llvm-commits]

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thurstond wrote:

The 4TB shadow mapping should never encounter the libc overlap problem, so the FileCheck alternative condition is unnecessary. Ideally, remove the unnecessary conditions so that we know if something went really wrong.

(The PIE binaries region starts at (256TB * 2 / 3 = 171TB), so any fixed shadow mapping above 171TB - such as 240TB - may overlap something important.)

https://github.com/llvm/llvm-project/pull/98574