re PR middle-end/86528 (strlen of constant string malfunction -- had to back out fix for PR middle-end/77357)

gcc:
2018-07-16  Bernd Edlinger  <bernd.edlinger@hotmail.de>

        PR middle-end/86528
        * builtins.c (check_access): Bail out if range[0] is no INTEGER_CST.
        * expr.c (string_constant): Fix the element size of ARRAY_TYPE.

testsuite:
2018-07-16  Bernd Edlinger  <bernd.edlinger@hotmail.de>

        PR middle-end/86528
        * gcc.c-torture/execute/pr86528.c: New test.
        * gcc.dg/Wrestrict-10.c (test_arr_strcat_2): Fix typo.

From-SVN: r262742