llvm-slicer: dont dereference freed memory
llvm-slicer: dont dereference freed memory

we need to call blk->size() before blk->remove()

Signed-off-by: Marek Chalupa <a05df156a69ad59faa9af9b666ef78009594c145@gmail.com>

mchalupa/dg,mchalupa/dg,mchalupa/dg,mchalupa/dg