Returns the instruction type of the instruction identified by
ii in the instruction queue. instr_type_t is a
bit-field of the different instruction types. Currently only
It_Load, It_Store, and
It_User_Decoder_Defined are available. For
instructions that swap data both It_Load and
It_Store are set.
EXCEPTIONS
Index Thrown if ii is illegal.
RETURN VALUE
The type of the instruction in the instruction queue.