[committed] Nios2: Add TARGET_CAN_INLINE_P hook

[Sandra Loosemore]

I've checked in the attached patch, which fixes 30+ FAILs across the gcc 
and g++ testsuites on nios2-elf target.  The only target options we have 
to worry about in this backend are the nios2 custom instructions, and 
the hashing in the default hook function seemed to be confused by all 
the extra state being stored in the options structure.  I've made it 
properly check that the custom instructions enabled in the callee must 
be a subset of those in the caller, with the same encoding in both cases.

-Sandra
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