[llvm-branch-commits] [llvm-size] Early return with error on invalid args (PR #128447)

[Fangrui Song via llvm-branch-commits]

MaskRay wrote:

A lot of utilities using LLVMOption, including clang and lld, are able to report multiple unknown option errors or other parsing errors before exiting. What the motivation behind this change?

https://github.com/llvm/llvm-project/pull/128447