[llvm] [IR][TBAA] Allow multiple fileds with same offset in TBAA struct-path (PR #76356)

[Bushev Dmitry via llvm-commits]

dybv-sc wrote:

> @dybv-sc Did you try out the extra testcases I mentioned (union of 2 structs) ? Can you also try out the effect of a union of arrays, and then referring to the 2nd element in the array ?

Sure, I'll add those them to test.

https://github.com/llvm/llvm-project/pull/76356