c.opt (flag_chkp_flexible_struct_trailing_arrays): Add new option.

c.opt (flag_chkp_flexible_struct_trailing_arrays): Add new option.

2016-12-27  Alexander Ivchenko  <alexander.ivchenko@intel.com>

* c-family/c.opt (flag_chkp_flexible_struct_trailing_arrays):
  Add new option.
  (fchkp-narrow-to-innermost-array): Fix typo.
* doc/cpp.texi (flag_chkp_flexible_struct_trailing_arrays): Ditto.
* tree-chkp.c (chkp_may_narrow_to_field ): Forbid
  narrowing when flag_chkp_flexible_struct_trailing_arrays is used
  and the field is the last array field in the structure.

2016-12-27  Alexander Ivchenko  <alexander.ivchenko@intel.com>

* gcc.target/i386/mpx/vla-trailing-1-lbv.c: New test.
* gcc.target/i386/mpx/vla-trailing-1-nov.c: Ditto.
* gcc.target/i386/mpx/vla-trailing-1-ubv.c: Ditto.

From-SVN: r243936