Add a generic malloc test for MALLOC_ALIGNMENT

1. Add sysdeps/generic/malloc-size.h to define size related macros for
malloc.
2. Move x86_64/tst-mallocalign1.c to malloc and replace ALIGN_MASK with
MALLOC_ALIGN_MASK.
3. Add tst-mallocalign1 to tests-exclude-mcheck for i386 and x32 since
mcheck doesn't honor MALLOC_ALIGNMENT.

malloc/malloc-internal.h

@@ -21,46 +21,7 @@
 
 #include <malloc-machine.h>
 #include <malloc-sysdep.h>
-
-/* INTERNAL_SIZE_T is the word-size used for internal bookkeeping of
-   chunk sizes.
-
-   The default version is the same as size_t.
-
-   While not strictly necessary, it is best to define this as an
-   unsigned type, even if size_t is a signed type. This may avoid some
-   artificial size limitations on some systems.
-
-   On a 64-bit machine, you may be able to reduce malloc overhead by
-   defining INTERNAL_SIZE_T to be a 32 bit `unsigned int' at the
-   expense of not being able to handle more than 2^32 of malloced
-   space. If this limitation is acceptable, you are encouraged to set
-   this unless you are on a platform requiring 16byte alignments. In
-   this case the alignment requirements turn out to negate any
-   potential advantages of decreasing size_t word size.
-
-   Implementors: Beware of the possible combinations of:
-     - INTERNAL_SIZE_T might be signed or unsigned, might be 32 or 64 bits,
-       and might be the same width as int or as long
-     - size_t might have different width and signedness as INTERNAL_SIZE_T
-     - int and long might be 32 or 64 bits, and might be the same width
-
-   To deal with this, most comparisons and difference computations
-   among INTERNAL_SIZE_Ts should cast them to unsigned long, being
-   aware of the fact that casting an unsigned int to a wider long does
-   not sign-extend. (This also makes checking for negative numbers
-   awkward.) Some of these casts result in harmless compiler warnings
-   on some systems.  */
-#ifndef INTERNAL_SIZE_T
-# define INTERNAL_SIZE_T size_t
-#endif
-
-/* The corresponding word size.  */
-#define SIZE_SZ (sizeof (INTERNAL_SIZE_T))
-
-/* The corresponding bit mask value.  */
-#define MALLOC_ALIGN_MASK (MALLOC_ALIGNMENT - 1)
-
+#include <malloc-size.h>
 
 /* Called in the parent process before a fork.  */
 void __malloc_fork_lock_parent (void) attribute_hidden;