c++/reflection: Allow address-splicing of non-static members [PR123660, PR123661]HEADtrunkmaster

In case of expressions like `&[:expr:]` where `expr` depends on a
template parameter, and the splice expression represents a `FIELD_DECL` or
a non-static member `FUNCTION_DECL`, that's exactly what we'd pass on.
However, `build_x_unary_op()` for these expressions is expecting an
`OFFSET_REF`. `OFFSET_REF` is also what gets passed to
`build_x_unary_op()` when templates are not involved.

There's also a difference between the template argument being a type and
using `members_of()` to get to the reflections of members (in which case
evaluating the `SPLICE_EXPR` returns a `FUNCTION_DECL` - `splice10.C`
test) and passing `^^T::member` as the template argument (in which case
evaluating the `SPLICE_EXPR` returns a `BASELINK` - `splice11.C`).

Signed-off-by: Boris Staletic <boris.staletic@protonmail.com>

	PR c++/123660
	PR c++/123661

gcc/cp/ChangeLog:

	* pt.cc (tsubst_splice_expr): Handle pointers to non-static members
	from splice expressions

gcc/testsuite/ChangeLog:

	* g++.dg/reflect/splice10.C: New test.
	* g++.dg/reflect/splice11.C: New test.

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