[clang] [clang][Darwin] Remove legacy framework search path logic in the frontend (PR #138234)

[Ian Anderson via cfe-commits]

ian-twilightcoder wrote:

> This one is still broken https://lab.llvm.org/buildbot/#/builders/55/builds/11054/steps/11/logs/stdio

I can't figure how this change would affect that, but let me give BuildSyntaxTreeTest a try.

https://github.com/llvm/llvm-project/pull/138234