Don't register the addresses of private symbols from expressions.

They're not supposed to go in the symbol table, and in fact the way the JIT
is currently implemented it sometimes crashes when you try to get the
address of such a function.  So we skip them.

llvm-svn: 264821

lldb/source/Expression/IRExecutionUnit.cpp

@@ -344,7 +344,7 @@ IRExecutionUnit::GetRunnableInfo(Error &error,
 
     for (llvm::Function &function : *m_module)
     {
-        if (function.isDeclaration())
+        if (function.isDeclaration() || function.hasPrivateLinkage())
             continue;
         
         const bool external = function.hasExternalLinkage() || function.hasLinkOnceODRLinkage();