[trans-mem] TM attributes vs C++ inheritance

[Richard Henderson <rth at redhat dot com>]

The language specification for C++ allows for putting attributes on the 
class itself, which then get automatically pushed out to any member 
functions defined by that class.  Further, it defines how these 
attributes get propagated down the class inheritance tree.  Finally, it 
has special rules for how these attributes are applied to virtual member 
functions, which ensure that when the virtual method is called on the 
base class, all of the implementation methods in the derived classes are 
compatible.

This patch appears to do the trick.  Comments on the implementation from 
the C++ maintainers?


r~

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