Make 8-byte tiny size class non-optional.

When tiny size class support was first added, it was intended to support
truly tiny size classes (even 2 bytes).  However, this wasn't very
useful in practice, so the minimum tiny size class has been limited to
sizeof(void *) for a long time now.  This is too small to be standards
compliant, but other commonly used malloc implementations do not even
bother using a 16-byte quantum  on systems with vector units (SSE2+,
AltiVEC, etc.).  As such, it is safe in practice to support an 8-byte
tiny size class on 64-bit systems that support 16-byte types.

include/jemalloc/internal/jemalloc_internal.h.in

@@ -118,13 +118,6 @@ static const bool config_tcache =
     false
 #endif
     ;
-static const bool config_tiny =
-#ifdef JEMALLOC_TINY
-    true
-#else
-    false
-#endif
-    ;
 static const bool config_tls =
 #ifdef JEMALLOC_TLS
     true