[clang] [clang-tools-extra] Clang/Preprocessor: Not add headers of __has_include into DepColloctor (PR #120673)

[Michael Spencer via cfe-commits]

Bigcheese wrote:

It's intentional that Clang reports these as dependencies. What issue do you have where you think this is the wrong behavior?

More specifically, https://reviews.llvm.org/D30882 originally added the behavior. This references an internal Apple bug that occurred when you have code that checks for the presence of a header but does not include it. Not reporting that dependency can lead to failed builds or miscompiles in incremental builds.

https://github.com/llvm/llvm-project/pull/120673