[ARM] Cleanups for 4cc9bd2eaa1063c68341c1c00e66660adcfdf254

- Document the meaning for OP_SCALAR, OP_SD and add OP_DD.
- Formatting cleanups
- Remove now redundant code for making compare instructions
  operate on scalar values.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
3 files changed