PS llvm: fix adding operands to phi nodes
PS llvm: fix adding operands to phi nodes

after we changed how getOperand works,
we need to just try if the operand exists

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

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