[patch rfc] Add frame memory & arch methods

[Andrew Cagney]

Hello,

This adds per-frame memory and architecture methods.  Instead of using 
the global variablecurrent_gdbarch and the context dependant 
read_memory, architecture code can use these.  Should help future proof 
architecture code should thread/target changes start happening.

It uses them in the d10v.

I'll commit in a few days.

Andrew
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