[llvm] GlobalsModRef, ValueTracking: Look through threadlocal.address intrinsic (PR #88418)

[Matthias Braun via llvm-commits]

MatzeB wrote:

Some backend tests changed apparently because the improved `getUnderlyingObject` results in better alias analysis (and consequently different scheduling decisions in PowerPC).

https://github.com/llvm/llvm-project/pull/88418