fix free-threaded

Author: Fidget-Spinner

Include/internal/pycore_frame.h

@@ -77,7 +77,7 @@ typedef struct _PyInterpreterFrame {
     char owner;
     char visited;
 #ifdef Py_DEBUG
-    char lltrace;
+    unsigned char lltrace;
 #endif
     /* Locals and stack */
     _PyStackRef localsplus[1];

Python/ceval_macros.h

@@ -154,7 +154,7 @@ GETITEM(PyObject *v, Py_ssize_t i) {
 /* The integer overflow is checked by an assertion below. */
 #define INSTR_OFFSET() ((int)(next_instr - _PyFrame_GetBytecode(frame)))
 #define NEXTOPARG()  do { \
-        _Py_CODEUNIT word  = {.cache = FT_ATOMIC_LOAD_UINT8_RELAXED(*(uint16_t*)next_instr)}; \
+        _Py_CODEUNIT word  = {.cache = FT_ATOMIC_LOAD_UINT16_RELAXED(*(uint16_t*)next_instr)}; \
         opcode = word.op.code; \
         oparg = word.op.arg; \
     } while (0)