Better Representation of LoopProf and EdgeProf

[vgene]

In order to help users to better identify hot loops and understand branch bias, should emit more text and/or annotate the source code with the loop/edge weight.

TODOs

• [ ] LoopProf: Show function name, loop name, code location for each line of loopProf.out
• [ ] EdgeProf: A tool to pinpoint or search the weight of one branch automatically