windows: Provide a definition for MP_ALWAYSINLINE.

mpy-cross/mpconfigport.h

@@ -135,6 +135,7 @@ typedef long mp_off_t;
 #define MP_ENDIANNESS_LITTLE        (1)
 #define NORETURN                    __declspec(noreturn)
 #define MP_NOINLINE                 __declspec(noinline)
+#define MP_ALWAYSINLINE             __forceinline
 #define MP_LIKELY(x)                (x)
 #define MP_UNLIKELY(x)              (x)
 #define MICROPY_PORT_CONSTANTS      { MP_ROM_QSTR(MP_QSTR_dummy), MP_ROM_PTR(NULL) }

ports/windows/mpconfigport.h

@@ -256,6 +256,7 @@ typedef long mp_off_t;
 #define NORETURN                    __declspec(noreturn)
 #define MP_WEAK
 #define MP_NOINLINE                 __declspec(noinline)
+#define MP_ALWAYSINLINE             __forceinline
 #define MP_LIKELY(x)                (x)
 #define MP_UNLIKELY(x)              (x)
 #define MICROPY_PORT_CONSTANTS      { MP_ROM_QSTR(MP_QSTR_dummy), MP_ROM_PTR(NULL) } // can't have zero-sized array