[2/4, committed] Relocations for Nios II R2

[Sandra Loosemore]

This patch adds support for Nios II R2 relocations.  A couple points to
note here:

(1) The R2 re-encodings of the R1 instruction set use the same
relocation names and numbers as R1 for instruction fields that retain 
the same size and semantics, but interpreted against the R2 encodings
with the new bit locations of the corresponding instruction fields.  We
implemented this using separate howto arrays for R1 and R2.

(2) The gap in the numbering between the common R1/R2 relocations and
R2-only relocations is deliberate, in case there is some need to add
more common relocations in the future.

Altera will be documenting the new R2 relocations when they publish the
revised ABI specification.

-Sandra

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