[gcov] Fix wrong line hit counts when multiple blocks are on the same line
The goal of this patch is to have the same behaviour than gcc-gcov.
Currently the hit counts for a line is the sum of the counts for each block on that line.
The idea is to detect the cycles in the graph of blocks in using the algorithm by Hawick & James.
The count for a cycle is the min of the counts for each edge in the cycle.
Once we've the count for each cycle, we can sum them and add the transition counts of those cycles.
Reviewers: marco-c, davidxl
Reviewed By: marco-c
Subscribers: vsk, lebedev.ri, sylvestre.ledru, dblaikie, llvm-commits
Differential Revision: https://reviews.llvm.org/D49659