Fix PR c++/70610 (wrong overload resolution during template processing)

Fix PR c++/70610 (wrong overload resolution during template processing)

gcc/cp/ChangeLog:

	PR c++/70610
	* tree.c (lvalue_kind) [NON_DEPENDENT_EXPR]: Unconditionally
	recurse into it.
	* typeck.c (build_x_conditional_expr): Unconditionally remember
	that the result is an lvalue or xvalue.

gcc/testsuite/ChangeLog:

	PR c++/70610
	* g++.dg/template/pr70610.C: New test.
	* g++.dg/template/pr70610-2.C: New test.
	* g++.dg/template/pr70610-3.C: New test.
	* g++.dg/template/pr70610-4.C: New test.

From-SVN: r234926