[compiler-rt] [TySan] Fix struct access with different bases (PR #120412)

[Sean McBride via llvm-commits]

seanm wrote:

@gbMattN This indeed sounds like some of the mystery issues TySan is flagging to me. Structs within structs are involved.  Could you rebase this against latest? Then I'll check out and try this patch.

https://github.com/llvm/llvm-project/pull/120412