GH-131498: Another refactoring of the code generator (GH-131827)

* Rename 'defined' attribute to 'in_local' to more accurately reflect how it is used

* Make death of variables explicit even for array variables.

* Convert in_memory from boolean to stack offset

* Don't apply liveness analyis to optimizer generated code

* Add 'out' parameter to stack.pop

Tools/cases_generator/generators_common.py

@@ -205,9 +205,9 @@ class Emitter:
         next(tkn_iter)  # Semi colon
         storage.clear_inputs("at ERROR_IF")
 
-        c_offset = storage.stack.peek_offset()
+        c_offset = storage.stack.sp_offset()
         try:
-            offset = -int(c_offset)
+            offset = int(c_offset)
         except ValueError:
             offset = -1
         self.out.emit(self.goto_error(offset, label, storage))