Sink DwarfUnit::constructImportedEntityDIE into DwarfCompileUnit.

So that it has access to getOrCreateGlobalVariableDIE. If we ever support
decsribing using directive in C++ classes (thus requiring support in type
units), it will certainly use another mechanism anyway.

Differential Revision: http://reviews.llvm.org/D5975

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220594 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/AsmPrinter/DwarfCompileUnit.h

@@ -123,6 +123,10 @@ public:
 
   DIE &constructAbstractSubprogramScopeDIE(LexicalScope *Scope);
 
+  /// \brief Construct import_module DIE.
+  std::unique_ptr<DIE>
+  constructImportedEntityDIE(const DIImportedEntity &Module);
+
   void finishSubprogramDefinition(DISubprogram SP);
 };