GitLab

Detail:
  * Added register definitions for the new registers in those wacky new ARM2
    chips, r8_fiq and r9_fiq.
  * Added abort and undefined mode register definitions using the ARM ARM
    standardised suffix of _abt and _und (previously we only had _abort and
    _undef versions).
  * Added some sanity checking of the fields parameter to the RestPSR macro,
    to help warn the unwary of the effect of compiling No32bitCode.
Admin:
  Changes appear to function as desired. Debug builds of MPEGDriver actually
  require those extra register definitions.

Version 1.23. Tagged as 'HdrSrc-1_23'