re PR tree-optimization/43236 (-ftree-loop-distribution produces wrong code in reload1.c:delete_output_reload(), bootstrap fails)

        PR tree-optimization/43236
        * tree-loop-distribution.c (generate_memset_zero): Fix off-by-one
        error in calculation of base address in reverse iteration case.
        (generate_builtin): Take number of latch executions if the statement
        is in the latch.
    
        * gcc.c-torture/execute/pr43236.c: New.

From-SVN: r157339