8031498: Cleanup and re-factorize PhaseChaitin::build_ifg_physical
Summary: Created sub-functions, added data structures, improved naming and removed unnecessary code
Reviewed-by: kvn, roland, rbackman
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CAT="@CAT@"
CD=cd
CP="@CP@"
DIFF="@DIFF@"
ECHO="@ECHO@"
FIND="@FIND@"
GREP="@GREP@"
RM="@RM@"
SED="@SED@"
POST_STRIP_CMD="@POST_STRIP_CMD@"