patch 8.2.5003: cannot do bitwise shifts

Problem:    Cannot do bitwise shifts.
Solution:   Add the >> and << operators. (Yegappan Lakshmanan, closes #8457)

src/vim.h

@@ -2808,4 +2808,5 @@ long elapsed(DWORD start_tick);
 #define FFED_IS_GLOBAL	1	// "g:" was used
 #define FFED_NO_GLOBAL	2	// only check for script-local functions
 
+#define MAX_LSHIFT_BITS (varnumber_T)((sizeof(uvarnumber_T) * 8) - 1)
 #endif // VIM__H