Merge mysql.com:/home/ram/work/b29079/b29079.4.1

into  mysql.com:/home/ram/work/b29079/b29079.5.0

include/my_global.h

@@ -895,7 +895,12 @@ typedef unsigned long	uint32; /* Short for unsigned integer >= 32 bits */
 typedef unsigned long	ulong;		  /* Short for unsigned long */
 #endif
 #ifndef longlong_defined
-#if defined(HAVE_LONG_LONG) && SIZEOF_LONG != 8
+/* 
+  Using [unsigned] long long is preferable as [u]longlong because we use 
+  [unsigned] long long unconditionally in many places, 
+  for example in constants with [U]LL suffix.
+*/
+#if defined(HAVE_LONG_LONG) && SIZEOF_LONG_LONG == 8
 typedef unsigned long long int ulonglong; /* ulong or unsigned long long */
 typedef long long int	longlong;
 #else