[clang] [clang-tools-extra] Remove `StringLiteral` in favor of `StringRef` (PR #122366)

[James Henderson via cfe-commits]

jh7370 wrote:

> Do we care about performance on MSVC ?

Just responding to this point (although I accept it's moot in the current context): yes we care about performance when building with MSVC - our downstream toolchain is hosted on Windows. I'm sure we're not the only Windows client either.

https://github.com/llvm/llvm-project/pull/122366