[MemProf] Minor fixes to dot graph printing (#128217) Two misc cleanup/improvements to the dot printing. Remove a redundant "style=filled" in the Node attributes. No effect on resulting graph. Add a "color" attribute to the Edge, with the same color name as "fillcolor". The latter only fills in the arrowhead, and the former is what affects the line. This makes the edge colors more visible, previously it was a black edge with a colored in arrowhead. For the second change, I added the new Edge color attributes to the checking in the two "basic.ll" tests, so we get some testing coverage of the full printing. For the other affected tests I removed the final "]'" after the fillcolor so it matches up through that attribute and ignores the rest of the line.
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