patch 7.4.1073

Problem:    Alloc_id depends on numbers, may use the same one twice.  It's not
            clear from the number what it's for.
Solution:   Use an enum.  Add a function to lookup the enum value from the
            name.

src/vim.h

@@ -1765,6 +1765,8 @@ typedef int proftime_T;	    /* dummy for function prototypes */
 
 #include "structs.h"	    /* file that defines many structures */
 
+#include "alloc.h"
+
 /* Values for "do_profiling". */
 #define PROF_NONE	0	/* profiling not started */
 #define PROF_YES	1	/* profiling busy */