Add test cases for STRBT, STRHT, LDRBT, LDRSBT, PLI.
Handle Iop_QAdd16Ux2.
Add test cases for SSAX, SXTAB16, SHASX, SHSAX, SHSUB8, UASX, USAX, UQADD16, UQASX, UQSAX, UHASX, UHSAX, REVSH.