TLSInfo:: fix syscall involcation of [gs]et_thread_area.

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@2484 ba6dc0ae-232f-0410-883f-9ebac64fc565
Disable optimization of mtcp_restart.c functions.

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@2485 ba6dc0ae-232f-0410-883f-9ebac64fc565