Add support for "type lookup" to find C and C++ types

This is an important first step in closing the functionality gap between "type lookup" and "images lookup -t"

rdar://28971388

llvm-svn: 285332
diff --git a/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.h b/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.h
index 68938b7..af60957 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.h
+++ b/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.h
@@ -92,6 +92,8 @@
     return lldb::eLanguageTypeC_plus_plus;
   }
 
+  std::unique_ptr<TypeScavenger> GetTypeScavenger() override;
+  
   lldb::TypeCategoryImplSP GetFormatters() override;
 
   HardcodedFormatters::HardcodedSummaryFinder GetHardcodedSummaries() override;