1. A method for issuing dynamic issue masks for processor hang prevention, the method comprising: storing an instruction in an issue queue for execution by an execution unit, wherein the instruction includes a encoded issue mask; determining whether the instruction in the issue queue is likely to be rescinded by the execution unit; based on determining that the instruction is not likely to be rescinded by the execution unit, issuing the instruction to the execution unit with a default issue mask; based on determining that the instruction is likely to be rescinded by the execution unit, issuing the instruction to the execution unit with a likely to be rescinded issue mask.