[patch] arch-status.html: New. (Take 4)

[rbrown64@csc.com.au]

This provides an excellent, information-dense summary of the data.
It might be easier to read if common or preferred case was blank and the
problematic characteristics had the character

         | Characteristics
Target   | HMSLQNFICBD lqrcpfgmbdhates
---------+----------------------------
alpha    | H??LQNFICBD lq cpfgmbdha
alpha*** |  ??           r          es **** for example
arc      | ???L N    D l  cp        e
arm      | HMSL NFI BD l  c f m dha es

For example, most ABI's are stack down - the few that aren't
should stand out.

Isn't the stack direction an ABI decision for the RISCs rather than
an architectural feature. In particular is PA64 ELF now stack down?