Fix huge_palloc() to handle size rather than usize input.

huge_ralloc() passes a size that may not be precisely a size class, so
make huge_palloc() handle the more general case of a size input rather
than usize.

This regression appears to have been introduced by the addition of
in-place huge reallocation; as such it was never incorporated into a
release.

include/jemalloc/internal/huge.h

@@ -11,7 +11,7 @@
 
 void	*huge_malloc(tsd_t *tsd, arena_t *arena, size_t size, bool zero,
     tcache_t *tcache);
-void	*huge_palloc(tsd_t *tsd, arena_t *arena, size_t usize, size_t alignment,
+void	*huge_palloc(tsd_t *tsd, arena_t *arena, size_t size, size_t alignment,
     bool zero, tcache_t *tcache);
 bool	huge_ralloc_no_move(void *ptr, size_t oldsize, size_t size,
     size_t extra, bool zero);