[4.7][google] Adding a new option "-fstack-protector-strong". (issue 5461043)

[xur@google.com]

OK for google branches.


http://codereview.appspot.com/5461043/diff/16001/gcc/cfgexpand.c
File gcc/cfgexpand.c (right):

http://codereview.appspot.com/5461043/diff/16001/gcc/cfgexpand.c#newcode1597
gcc/cfgexpand.c:1597: contain an array or are arrays. */
"," before "or", and
two spaces before "*/".

http://codereview.appspot.com/5461043/diff/16001/gcc/cfgexpand.c#newcode1709
gcc/cfgexpand.c:1709: create_stack_guard ();
it's better to merge to the earlier if statement. something like:
   if (flag_stack_protect == 2
       || (flag_stack_protect == 3 && gen_stack_protect_signal)
       || (flag_stack_protect
  	  && (cfun->calls_alloca || has_protected_decls)))
      create_stack_guard ();

http://codereview.appspot.com/5461043/