[PATCH v2] Make lto-dump dump callgraph in DOT format

[Giuliano Belinassi]

This patch makes lto-dump the symtab callgraph in graphviz DOT format.

Previously, the suggested patch had some minor and checkstyle issues
that were fixed in this version.


    gcc/ChangeLog
    2019-07-02  Giuliano Belinassi  <giuliano.belinassi@usp.br>

            * cgraph.c (dump_graphviz): New function
            * cgraph.h (dump_graphviz): New function
            * symtab.c (dump_graphviz): New function

    gcc/lto/ChangeLog
    2019-07-02  Giuliano Belinassi  <giuliano.belinassi@usp.br>

            * lang.opt (flag_dump_callgraph): New flag
            * lto-dump.c (dump_symtab_graphviz): New function
            * lto-dump.c (dump_tool_help): New option
            * lto-dump.c (lto_main): New option
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