[clang] [llvm][tblgen] Add `SourcePath` for `emitSourceFileHeader` (PR #65744)

[NAKAMURA Takumi via cfe-commits]

================
@@ -59,4 +60,8 @@ void llvm::emitSourceFileHeader(StringRef Desc, raw_ostream 
&OS) {
   printLine(OS, Prefix, ' ', Suffix);
   printLine(OS, "\\*===", '-', "===*/");
   OS << '\n';
+
+  // Print the path of source file
+  if (!Record.getInputFilename().empty())
+    OS << "// Generated from: " << Record.getInputFilename() << "\n\n";
----------------
chapuni wrote:

I think this could be enabled if the base path would be given from the build 
system.

https://github.com/llvm/llvm-project/pull/65744
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