re PR tree-optimization/18507 (block_defs_stack varrray should not be GC'ed)

re PR tree-optimization/18507 (block_defs_stack varrray should not be GC'ed)

2004-11-19  Andrew Pinski  <pinskia@physics.uc.edu>

        PR tree-opt/18507
        * tree-flow.h (tree2): Typedef because there is already a VEC(tree).
        Define a VEC(tree2) for head.
        (register_new_def): Change second argument to be a VEC(tree2).
        * tree-ssa-dom.c (block_defs_stack): Change to be a VEC(tree2).
        (tree_ssa_dominator_optimize): Initialize block_defs_stack with
        the VEC(tree2) function.  Also free it before returning.
        (dom_opt_initialize_block): Use VEC_safe_push instead of VARRAY_PUSH_TREE
        for block_defs_stack.
        (restore_currdefs_to_original_value): Use VEC_length instead of
        VARRAY_ACTIVE_SIZE. VEC_pop instead of VARRAY_TOP_TREE/VARRAY_POP.
        (dom_opt_finalize_block): Use VEC_safe_push instead of VARRAY_PUSH_TREE
        for block_defs_stack.
        * tree-into-ssa.c (block_defs_stack): Change to be a VEC(tree2).
        (rewrite_initialize_block): Use VEC_safe_push instead of VARRAY_PUSH_TREE
        for block_defs_stack.
        (ssa_register_new_def): Likewise.
        (ssa_rewrite_initialize_block): Likewise.
        (rewrite_finalize_block): Use VEC_length instead of
        VARRAY_ACTIVE_SIZE. VEC_pop instead of VARRAY_TOP_TREE/VARRAY_POP.
        (ssa_rewrite_finalize_block): Likewise.
        (register_new_def): Change second argument to be a VEC(tree2).
        Use VEC_safe_push instead of VARRAY_PUSH_TREE.
        (rewrite_blocks): Initialize block_defs_stack with
        the VEC(tree2) function.  Also free it before returning.
        (rewrite_ssa_into_ssa): Likewise.

From-SVN: r90926