Revert "Revert "PR14606: debug info imported_module support""

This reverts commit r179840 with a fix to test/DebugInfo/two-cus-from-same-file.ll

I'm not sure why that test only failed on ARM & MIPS and not X86 Linux, even
though the debug info was clearly invalid on all of them, but this ought to fix
it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179996 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.h b/lib/CodeGen/AsmPrinter/DwarfDebug.h
index 9a38256..1eb7e3e 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.h
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.h
@@ -555,6 +555,9 @@
   /// \brief Construct subprogram DIE.
   void constructSubprogramDIE(CompileUnit *TheCU, const MDNode *N);
 
+  /// \brief Construct import_module DIE.
+  void constructImportedModuleDIE(CompileUnit *TheCU, const MDNode *N);
+
   /// \brief Register a source line with debug info. Returns the unique
   /// label that was emitted and which provides correspondence to the
   /// source line list.