[clang-tools-extra] Be more permissive on spaces in command line argument parsing (PR #205111)

[Nathan Ridge via cfe-commits]

HighCommander4 wrote:

I don't understand the connection between https://github.com/llvm/llvm-project/commit/c888371ff0a3e10f8472676dc992f4347fca58d9 / `-resource-dir` and this patch -- could you elaborate?

Did https://github.com/llvm/llvm-project/commit/c888371ff0a3e10f8472676dc992f4347fca58d9 regress `did-change-configuration-params.test` in some configuration?

https://github.com/llvm/llvm-project/pull/205111