out-of-bounds write in flow

[Jason Merrill]

With the current CVS tree, I'm getting crashes building tlist from
libstdc++ with optimization on i686-linux, because the malloc information
is being bashed by an out-of-bounds write.  This happens because when
compiling main, max_uid_for_flow is determined to be 15375, but then we
end up messing with an insn of UID 15377.

Richard, this testcase can also be found at ~jason/gtt/tlist.ii.  Just
compile with -O.
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