[committed 0/2] MIPS: Don't use a 32-bit architecture with a 64-bit ABI

[Maciej W. Rozycki]

Hi,

 This mini patch series addresses an issue on an internal error when an 
attempt is made to use a 32-bit architecture with a 64-bit ABI.  This is 
clearly an unsupported combination and we should handle it gracefully.

 A preparatory change is required so that the ABI in effect is determined 
before a target description is loaded.  This is because we change 
architecture information and that is needed to initialise OS dependent 
register information, which in turn target description loading relies on.  
It actually seems cleaner to do this in this order regardless.

 This has been extensively regression-tested with o32, n32 and n64 ABIs in 
both native and remote configurations each, and now committed.

 See individual change descriptions for details.

  Maciej