[clang] [clang-scan-deps] Fix "unterminated conditional directive" bug (PR #146645)

[Naveen Seth Hanig via cfe-commits]

https://github.com/naveen-seth commented:

I realized that I probably should have also removed the following code in #143950:

https://github.com/llvm/llvm-project/blob/2b03efc7fba813bb0c52b7016867f200a91c2d34/clang/lib/Lex/DependencyDirectivesScanner.cpp#L445-L451

The logic added in #143950 also handles line splices with 0 trailing whitespace characters, so this code is now redundant.

Should I make a separate PR for this?

https://github.com/llvm/llvm-project/pull/146645