fix catch handlers / match statements yielding past scope

compiler/ast/ast.odin

@@ -160,6 +160,7 @@ Stmt :: struct {
 	label:      symbol.Id,
 	type:       Type_Syntax,
 	immutable:  bool,
+	value_control_flow: bool,
 	pointer_capture: bool,
 	// Assignments store the lvalue in `target`, the right-hand side in `expr`,
 	// and the source operator in `assignment_op`. `Set` is ordinary `=`;