re PR tree-optimization/87672 (81512c36 causes ICE in bootstrap stage 3 using "-D_FOR...

re PR tree-optimization/87672 (81512c36 causes ICE in bootstrap stage 3 using "-D_FORTIFY_SOURCE=2"   (invalid operand in unary operation, incorrect sharing of tree nodes, verify_gimple failed))

gcc:
2018-11-04  Bernd Edlinger  <bernd.edlinger@hotmail.de>

        PR tree-optimization/87672
        * gimple-fold.c (gimple_fold_builtin_stxcpy_chk): Gimplify.
        * tree-ssa-strlen.c (handle_builtin_strcat): Adjust object size.

testsuite:
2018-11-04  Bernd Edlinger  <bernd.edlinger@hotmail.de>

        PR tree-optimization/87672
        * gcc.dg/pr87672.c: New test.

From-SVN: r265777