[clang] added regcall struct by reg support (PR #95257)

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mahesh-attarde wrote:

> What you're implementing in this change doesn't seem like it brings us much closer to what the document says. I mean, it handles the specific structs in your testcase, but the algorithm you're using doesn't generalize.

Can you suggest case which  can be useful in generalizing?



https://github.com/llvm/llvm-project/pull/95257