do not read behind signature boundaries
do not read behind signature boundaries

 - when NumNamed count is wrong
 - assemblies with such a problem are used in #28198

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