[clang] [C++20][Modules] Implement P1857R3 Modules Dependency Discovery (PR #107168)

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@@ -912,6 +931,10 @@ bool Scanner::lexPPLine(const char *&First, const char *const End) {
     CurDirToks.clear();
   });
 
+  // FIXME: Shoule we handle @import as a preprocessing directive?
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yronglin wrote:

I've basically implemented this in a separate patch https://github.com/llvm/llvm-project/pull/157726

https://github.com/llvm/llvm-project/pull/107168