Save a little bit of memory that was being reserved in a UniqueCStringMap
vector that can be sized to fit.

llvm-svn: 147324
diff --git a/lldb/source/Symbol/Symtab.cpp b/lldb/source/Symbol/Symtab.cpp
index bd3b17c..0dd5f31 100644
--- a/lldb/source/Symbol/Symtab.cpp
+++ b/lldb/source/Symbol/Symtab.cpp
@@ -322,6 +322,7 @@
                                                         
         }
         m_name_to_index.Sort();
+        m_name_to_index.SizeToFit();
     }
 }