Add lval_funcs::is_optimized_out
This adds an is_optimized_out function pointer to lval_funcs, and changes value_optimized_out to call it. This new function lets gdb determine if a value is optimized out without necessarily fetching the value. This is needed for a subsequent patch, where an attempt to access a lazy value would fail due to the value size limit -- however, the access was only needed to determine the optimized-out state.
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