[llvm] [DebugInfo][DWARF] Don't emit bogus DW_AT_call_target for complex calls (PR #151378)

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thejh wrote:

@dwblaikie Thanks for the reviews!

I don't have LLVM push access - can you land this change for me? I will then make the requested change to https://github.com/llvm/llvm-project/pull/132073 and rebase it (since that change will likely merge-conflict with this one).

https://github.com/llvm/llvm-project/pull/151378