When a function is defined, set its symbol's position to the code position.

Before, if the function was declared before being defined, then the symbol's
SourcePos would be left set to the position of the declaration.  This ended
up getting the debugging symbols mixed up in this case, which was undesirable.

parse.yy

@@ -1862,8 +1862,11 @@ function_definition
                 dynamic_cast<const FunctionType *>($2->type);
             if (funcType == NULL)
                 Assert(m->errorCount > 0);
-            else
-                m->AddFunctionDefinition($2->name, funcType, $4);
+            else {
+                Stmt *code = $4;
+                if (code == NULL) code = new StmtList(@4);
+                m->AddFunctionDefinition($2->name, funcType, code);
+            }
         }
         m->symbolTable->PopScope(); // push in lAddFunctionParams();
     }