Don't follow QuoteNodes when bulding edges (#48)

Fixes #47

Author: timholy

src/codeedges.jl

@@ -304,8 +304,6 @@ function add_links!(target::Pair{Union{SSAValue,SlotNumber,NamedVar},Links}, @no
         for i in arng
             add_links!(target, stmt.args[i], cl)
         end
-    elseif isa(stmt, QuoteNode)
-        add_links!(target, stmt.value, cl)
     elseif is_GotoIfNot(stmt)
         add_links!(target, (stmt::Core.GotoIfNot).cond, cl)
     elseif is_ReturnNode(stmt)

test/codeedges.jl

@@ -185,7 +185,6 @@ end
     edges = CodeEdges(src)
     # Check that the StructParent name is discovered everywhere it is used
     var = edges.byname[:StructParent]
-    @test var.preds[end] ∈ var.succs
     isrequired = minimal_evaluation(hastrackedexpr, src, edges)
     selective_eval_fromstart!(frame, isrequired, true)
     @test supertype(ModSelective.StructParent) === AbstractArray