8075492: adopt recent IGV Summary: adopted recent sources, updated README, added build and run instructions; ignored IGV build files in Mercurial; adapted HotSpot Ideal graph printer to current IGV's data format schema; reintroduced control flow window and basic block layout Reviewed-by: kvn, roland Contributed-by: Andreas Woess <andreas.woess@oracle.com>, Bernhard Urban <bernhard.urban@oracle.com>, Christian Haeubl <christian.haeubl@oracle.com>, Doug Simon <doug.simon@oracle.com>, Gilles Duboscq <gilles.duboscq@oracle.com>, Lukas Stadler <lukas.stadler@oracle.com>, Peter Hofer <peter.hofer@jku.at>, Roland Schatz <roland.schatz@oracle.com>, Thomas Wuerthinger <thomas.wuerthinger@oracle.com>, Tom Rodriguez <tom.rodriguez@oracle.com>

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README:

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  This file should be located at the top of the hotspot Mercurial repository.

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  See http://openjdk.java.net/ for more information about the OpenJDK.

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  See ../README-builds.html for complete details on build machine requirements.

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Simple Build Instructions:

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    cd make && gnumake

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  The files that will be imported into the jdk build will be in the "build"

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  directory.

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