[NFC] Print clang location of imported decls

…in DeclContext::dumpContext(). This makes the dumps more usable since these declarations otherwise don’t have usable filenames or line numbers.

Author: Becca Royal-Gordon

lib/AST/DeclContext.cpp

@@ -30,6 +30,7 @@
 #include "llvm/ADT/Statistic.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Support/SaveAndRestore.h"
+#include "clang/AST/ASTContext.h"
 using namespace swift;
 
 #define DEBUG_TYPE "Name lookup"
@@ -734,6 +735,14 @@ unsigned DeclContext::printContext(raw_ostream &OS, const unsigned indent,
   }
   }
 
+  if (auto decl = getAsDecl())
+    if (decl->getClangNode().getLocation().isValid()) {
+      auto &clangSM = getASTContext().getClangModuleLoader()
+                          ->getClangASTContext().getSourceManager();
+      OS << " clang_loc=";
+      decl->getClangNode().getLocation().print(OS, clangSM);
+    }
+
   if (!onlyAPartialLine)
     OS << "\n";
   return Depth + 1;