Convert C (un)signed long long values to bignums properly. This patch also does the following: - Uses make_fixnum instead of make_integer when the argument is guaranteed to be in the fixnum range. - Introduces make_unsigned_integer so that we handle unsigned values with the high bit set correctly. - Introduces conversions between bignums and (un)signed long long values. - Uses mp_set_memory_functions with the BSD MP code, if it exists. - Eliminates some unnecessary consing in the Lisp + and * implementations. - Fixes a problem with check_valid_xbm_inline(). This function is called during intialization. It calls Ftimes. When using pdump, this is a problem, because (a) the bignum code is not initialized until *after* dumping, so we don't try to dump any bignums, and (b) multiplication of integers is done inside bignums so we handle fixnum overflow correctly. I decided that an XBM file with dimensions that don't fit into fixnums is probably not something we want to try to handle anyway, and did the arithmetic with C values instead of Lisp values. Doing that broke one test, which started getting a different error message from the one it expected, so I adjusted the test to match the new reality. - Fixes a few miscellaneous bugs in the BSD MP code. See <CAHCOHQk0u0=eD1fUMHTNWi2Yh=1WgiYyCXdMbsGzHBNhdqYz4w@mail.gmail.com> in xemacs-patches, as well as followup messages.

--- a/src/lisp.h	Wed Apr 24 20:16:14 2013 -0400
+++ b/src/lisp.h	Mon Jun 17 10:23:00 2013 -0600
@@ -1677,11 +1677,14 @@
 
 #define FIXNUM_VALBITS (BITS_PER_EMACS_INT - FIXNUM_GCBITS)
 #define VALBITS (BITS_PER_EMACS_INT - GCBITS)
-#define MOST_POSITIVE_FIXNUM ((EMACS_INT) ((1UL << (FIXNUM_VALBITS - 1)) -1UL))
+#define MOST_POSITIVE_FIXNUM_UNSIGNED ((1UL << (FIXNUM_VALBITS - 1)) -1UL)
+#define MOST_POSITIVE_FIXNUM ((EMACS_INT) MOST_POSITIVE_FIXNUM_UNSIGNED)
 #define MOST_NEGATIVE_FIXNUM (-(MOST_POSITIVE_FIXNUM) - 1)
 /* WARNING: evaluates its arg twice. */
 #define NUMBER_FITS_IN_A_FIXNUM(num) \
   ((num) <= MOST_POSITIVE_FIXNUM && (num) >= MOST_NEGATIVE_FIXNUM)
+#define UNSIGNED_NUMBER_FITS_IN_A_FIXNUM(num) \
+  ((num) <= MOST_POSITIVE_FIXNUM_UNSIGNED)
 
 #ifdef USE_UNION_TYPE
 # include "lisp-union.h"