[clang] [llvm] [Clang][Driver][LLVM] Add -fno-inline-functions-called-once; expose p… (PR #160343)

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Karthikdhondi wrote:

> The LLVM changes and Clang flag changes should likely be separate

Thanks! I’ve split the change as suggested.

https://github.com/llvm/llvm-project/pull/160343