[analyzer; new edges] Don't eliminate subexpr edge cycles if the line is long.

Specifically, if the line is over 80 characters, or if the top-level
statement spans mulitple lines, we should preserve sub-expression edges
even if they form a simple cycle as described in the last commit, because
it's harder to infer what's going on than it is for shorter lines.

llvm-svn: 183163