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

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Karthikdhondi wrote:

> While GCC has -finline-functions-called-once, we don't blindly copy every option it supports. Please provide clear, technical justification. The description looks AI-generated, making it difficult to assess its value.
> 
> > Thanks! I’ve split the change as suggested.
> 
> I don't think you split the LLVM and Clang side changes.

Apologies for not conveying better.
 
We are working on a large application code base that was earlier compiled with GNU toolchain. Compiler option "-fno-inline-functions-called-once" was used. Now considering the benefits of LLVM toolchain, they want to have similar option with LLVM. Using __attribute__((no-inline)), requires making changes to application which is not a feasible option. 
 
So, I have enabled the pass in LLVM it worked fine, and thought to create a PR  for the same. So that, it might be helpful for others too.

By splitting the changes means, Do I need to create two different PRs for LLVM and Clang side changes?

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