[clang] [clang][modules] Print library module manifest path. (PR #76451)

[Mark de Wever via cfe-commits]

================
@@ -0,0 +1,40 @@
+// Test that -print-library-module-manifest-path finds the correct file.
----------------
mordante wrote:

not per se, I thought this was common in clang, I'll remove it.

https://github.com/llvm/llvm-project/pull/76451