[clang] [clang][Driver] Add flag for setting SkipFunctionBodies (PR #100135)

[Ilya Biryukov via cfe-commits]

ilya-biryukov wrote:

I am generally supportive of the idea to expose this for more easily reproducing bugs in source tools, and clangd, in particular.
However, I think it'd be useful to make sure the Clang maintainers are on board.
@cor3ntin, @AaronBallman do you  have any objection to exposing this option?

https://github.com/llvm/llvm-project/pull/100135