don't write symbols for methods without sequence points
don't write symbols for methods without sequence points

mono/cecil,ttRevan/cecil,kzu/cecil,saynomoo/cecil,cgourlay/cecil,SiliconStudio/Mono.Cecil,gluck/cecil,joj/cecil,xen2/cecil,jbevain/cecil,furesoft/cecil,sailro/cecil,fnajera-rac-de/cecil