Add const qualifier to Mangled::GuessLanguage

llvm-svn: 240676
diff --git a/lldb/source/Core/Mangled.cpp b/lldb/source/Core/Mangled.cpp
index 4ba320d..00a90a7 100644
--- a/lldb/source/Core/Mangled.cpp
+++ b/lldb/source/Core/Mangled.cpp
@@ -423,7 +423,7 @@
 }
 
 lldb::LanguageType
-Mangled::GuessLanguage ()
+Mangled::GuessLanguage () const
 {
     ConstString mangled = GetMangledName();
     if (mangled)