Split off from D22121.

Add display of raw opcode to the examine command when using the "alternate format" format character I, which previously just worked the same as i, as it's useful sometimes to be able to see the raw opcodes alongside the disassembly.

Since PowerPC has a fixed instruction width of 32 bits, instructions are always aligned, there are no "modes", and we don't have multiple competing assembly syntaxes, "show the raw opcodes alongside the disassembly" seemed like the obvious interpretation of "alternate format" to me.