shared/runtime/pyexec: Cleanup EXEC_FLAG flag constants.

- Cleanup pyexec flags definitions so it's clear they are different.
- Use mp_uint_t for exec_flags because it should be unsigned.

shared/runtime/pyexec.c

@@ -50,20 +50,20 @@ int pyexec_system_exit = 0;
 STATIC bool repl_display_debugging_info = 0;
 #endif
 
-#define EXEC_FLAG_PRINT_EOF (1)
-#define EXEC_FLAG_ALLOW_DEBUGGING (2)
-#define EXEC_FLAG_IS_REPL (4)
-#define EXEC_FLAG_SOURCE_IS_RAW_CODE (8)
-#define EXEC_FLAG_SOURCE_IS_VSTR (16)
-#define EXEC_FLAG_SOURCE_IS_FILENAME (32)
-#define EXEC_FLAG_SOURCE_IS_READER (64)
+#define EXEC_FLAG_PRINT_EOF             (1 << 0)
+#define EXEC_FLAG_ALLOW_DEBUGGING       (1 << 1)
+#define EXEC_FLAG_IS_REPL               (1 << 2)
+#define EXEC_FLAG_SOURCE_IS_RAW_CODE    (1 << 3)
+#define EXEC_FLAG_SOURCE_IS_VSTR        (1 << 4)
+#define EXEC_FLAG_SOURCE_IS_FILENAME    (1 << 5)
+#define EXEC_FLAG_SOURCE_IS_READER      (1 << 6)
 
 // parses, compiles and executes the code in the lexer
 // frees the lexer before returning
 // EXEC_FLAG_PRINT_EOF prints 2 EOF chars: 1 after normal output, 1 after exception output
 // EXEC_FLAG_ALLOW_DEBUGGING allows debugging info to be printed after executing the code
 // EXEC_FLAG_IS_REPL is used for REPL inputs (flag passed on to mp_compile)
-STATIC int parse_compile_execute(const void *source, mp_parse_input_kind_t input_kind, int exec_flags) {
+STATIC int parse_compile_execute(const void *source, mp_parse_input_kind_t input_kind, mp_uint_t exec_flags) {
     int ret = 0;
     #if MICROPY_REPL_INFO
     uint32_t start = 0;
@@ -135,6 +135,7 @@ STATIC int parse_compile_execute(const void *source, mp_parse_input_kind_t input
         if (exec_flags & EXEC_FLAG_PRINT_EOF) {
             mp_hal_stdout_tx_strn("\x04", 1);
         }
+
         // check for SystemExit
         if (mp_obj_is_subclass_fast(MP_OBJ_FROM_PTR(((mp_obj_base_t *)nlr.ret_val)->type), MP_OBJ_FROM_PTR(&mp_type_SystemExit))) {
             // at the moment, the value of SystemExit is unused