[clang] [InstallAPI] Hookup Input files & basic ASTVisitor (PR #82552)

[Fangrui Song via cfe-commits]

MaskRay wrote:

> > Since clangFrontend depends on clangInstallAPI,
> 
> @MaskRay Thanks for reporting this issue. Is it possible the issue is from a stale build? `clangFrontend` should no longer depend on `clangInstallAPI`. That dependency was removed in [0a518db#diff-9606e9f9f8eb1bb317db32ba8ee0a8f436389ed68cea0051646a1267c772cd6cL58](https://github.com/llvm/llvm-project/commit/0a518db99e0cffcdbb4cae73e27da87edbb25170#diff-9606e9f9f8eb1bb317db32ba8ee0a8f436389ed68cea0051646a1267c772cd6cL58)

Thanks for the quick reply! I just noticed that clangFrontend no longer depends on clangInstallAPI. So there is no circular dependency.

I fixed the Bazel build with d1f04443b14f3cfc565656fb14d283f729d95344 .

https://github.com/llvm/llvm-project/pull/82552