fix Issue 9565 - Index of static array should not print literal suffix

Static array type index is always size_t, so unnecessary suffix is harmful for platform independent diagnostic message.
(Note that: In 64bit platform, size_t is ulong, and if the value is greater than long.max, suffix is *necessary*.)

Same problem exists in IndexExp and SliceExp printing.
Merge pull request #2522 from 9rnsr/fix9565

Issue 9565 - Index of static array should not print literal suffix