[clang] [Clang] Treat line directives as header names. (PR #211512)

[Corentin Jabot via cfe-commits]

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@@ -1599,6 +1599,21 @@ static bool GetLineValue(Token &DigitTok, unsigned &Val,
   return false;
 }
 
+// Unlike header-names, line directive only support filenames in double quotes
+// but does support empty filenames.
+static void GetFilenameSpellingForLineDirective(const Preprocessor &PP,
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cor3ntin wrote:

That was i did initially but it was strictly worse. Different diags, different constraints... I'm happy with a different name though, if you want

https://github.com/llvm/llvm-project/pull/211512