re PR c/57821 ('array is too large' error is missing when sizetype overflows)

re PR c/57821 ('array is too large' error is missing when sizetype overflows)

gcc/c:
        PR c/57821
        * c-typeck.c (set_init_index): When folding, check for index overflow.
gcc/c-family:
        PR c/57821
        * c-common.c (complete_array_type): Delay folding first index
        like other indices.  When folding, check for index overflow.
gcc/testsuite:
        PR c/57821
        * gcc.dg/large-size-array-6.c: New test.

From-SVN: r200683