Add more details to hot/cold partitioning comments and documentation.

Add more details to hot/cold partitioning comments and documentation.

2004-08-25  Caroline Tice  <ctice@apple.com>

        * bb-reorder.c (partition_hot_cold_basic_blocks):  Add more details
        to comments at start of function.
        * cfgbuild.c (make_edges):  Add more details to hot/cold partitioning
        comment.
        * cfgcleanup.c (try_simplify_condjump, try_forward_edges,
        merge_blocks_move_predecessor_nojumps,
        merge_blocks_move_successor_nojumps, merge_blocks_move,
        try_crossjump_to_edge, try_crossjump_bb): Likewise.
        * cfglayout.c (fixup_reorder_chain): Likewise.
        * cfgrtl.c (rtl_can_merge_blocks, try_redirect_by_replacing_jump,
        cfg_layout_can_merge_blocks_p):  Likewise.
        * ifcvt.c (find_if_case_1, find_if_case_2): Likewise.
        * passes.c (rest_of_compilation): Update comments for calling
        optimization that partitions hot/cold basic blocks.
        * doc/invoke.texi:  Update documentation of
        freorder-blocks-and-partition flag.

From-SVN: r86570