[COMMITTED PATCH] BZ#18383: Add test case for large alignment in TLS blocks.

[Roland McGrath]

The log entry needs the BZ# marker.  

I'm having a hard time finding the calculation in the dynamic-linking case
that corresponds to this piece of __libc_setup_tls.  Since there are two
places where the logic should match, we really should make it much more
clear how they relate.  If there isn't any obvious refactoring that would
share more of this logic between the two cases, can you at least add a
comment in __libc_setup_tls that points to the implementation of the
matching logic in the dynamic-linking case?


Thanks,
Roland