Fix -Wclobbered warnings

load.c

@@ -1284,7 +1284,7 @@ require_internal(rb_execution_context_t *ec, VALUE fname, int exception, bool wa
             else {
                 switch (found) {
                   case 'r':
-                    load_iseq_eval(ec, path);
+                    load_iseq_eval(saved.ec, path);
                     break;
 
                   case 's':

thread.c

@@ -1790,6 +1790,7 @@ rb_thread_io_blocking_call(rb_blocking_function_t *func, void *data1, int fd, in
     {
         EC_PUSH_TAG(ec);
         if ((state = EC_EXEC_TAG()) == TAG_NONE) {
+            volatile enum ruby_tag_type saved_state = state; /* for BLOCKING_REGION */
           retry:
             BLOCKING_REGION(waiting_fd.th, {
                 val = func(data1);
@@ -1803,6 +1804,7 @@ rb_thread_io_blocking_call(rb_blocking_function_t *func, void *data1, int fd, in
                 RUBY_VM_CHECK_INTS_BLOCKING(ec);
                 goto retry;
             }
+            state = saved_state;
         }
         EC_POP_TAG();