[clang] [clang][DebugInfo] Attach `DISubprogram` to additional call variants (PR #166202)

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asmok-g wrote:

Heads-up: This is causing ~1.5% increase in bin size of clang when built internally in Google and ~1.8% increase in dwp file. It does the same for a couple other internal google targets. I'm posting a heads-up for now and we will discuss internally how much of an issue this is before we come back to the thread. Thanks

https://github.com/llvm/llvm-project/pull/166202