[lld] [lld] clang-format sources (PR #183805)

[Fangrui Song via llvm-commits]

MaskRay wrote:

I think bulk reformatting of stable code is against LLVM project norms. 

The writeLong/writePlt changes are arguably worse than the original.
The InputSection.cpp splitStack wrapping (81 column) isn't necessary.

The Thunks.h include order and indentation fix are acceptable.

https://github.com/llvm/llvm-project/pull/183805