Introduce the notion of a "minimal" import of ASTs, to better support LLDB.

llvm-svn: 123723
diff --git a/clang/lib/Frontend/ASTMerge.cpp b/clang/lib/Frontend/ASTMerge.cpp
index ec07441..3905b99 100644
--- a/clang/lib/Frontend/ASTMerge.cpp
+++ b/clang/lib/Frontend/ASTMerge.cpp
@@ -52,7 +52,8 @@
     ASTImporter Importer(CI.getASTContext(), 
                          CI.getFileManager(),
                          Unit->getASTContext(), 
-                         Unit->getFileManager());
+                         Unit->getFileManager(),
+                         /*MinimalImport=*/false);
 
     TranslationUnitDecl *TU = Unit->getASTContext().getTranslationUnitDecl();
     for (DeclContext::decl_iterator D = TU->decls_begin(),