Add Reverse Bit/Byte support in AArch32 Semantics

[sschriner]

Test Instructions for Reverse Bit/Byte:

• [x] REV R1, R2 - 21fbfe6
• [x] REV16 R1, R3 - b31fbfe6
• [x] RBIT R1, R4. - 341fffe6
• [x] REVSH R1, R5 - b51fffe6

Also added Bitfield Insert:

• [x] BFC R1, #3, #4 - 9f11c6e7
• [x] BFI R1, R2, #5, #4 - 9212c8e7

to make sure we cover all basic bit insert/rotation/extraction operations