From 155ced809260c4ce203df1b66f78f66584d44a80 Mon Sep 17 00:00:00 2001
From: Chris Lattner
The Module symbol table works just like the Function symbol table when it -comes to name conflicts: if a new function is created with a name was previously -added to the symbol table, it will get implicitly renamed when added to the +comes to name conflicts: if a new function is created with a name that was previously +added to the symbol table, the new function will get implicitly renamed when added to the Module. The code above exploits this fact to determine if there was a previous definition of this function.