[clang] [llvm] Convert clang-format to Opt and add multicall support (PR #201730)

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mydeveloperday wrote:

@AaronBallman can you help us clarify if this is an LLVM team decision that we need to follow, I'm more inclined to reject this (I see similar comments in clang-tidy PR)

https://github.com/llvm/llvm-project/pull/201730