[patch] provide type_align gdbarch function for nios2

[Sandra Loosemore]

The attached patch fixes almost 400 failures in gdb.base/align.exp and 
related tests due to a missing definition for the type_align hook for 
nios2.  I swiped the definition of the hook from the arc backend which 
has similar conventions: the alignment of byte/halfword types matches 
their size, but all types 4 bytes or larger are aligned on a 4-byte 
boundary.

OK to commit?

-Sandra
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