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

[James Y Knight via llvm-commits]

jyknight wrote:

I'm a bit worried of this, though I'm not sure if my worry is valid or not.

I worry that adding such code before we fix the underlying representation (to make the thread_local GlovalValue no longer incorrect pretend like it represents an address at the IR level) will end up making it more difficult to do so.

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