c++: double non-dep folding from finish_compound_literal [PR104565]

c++: double non-dep folding from finish_compound_literal [PR104565]

In finish_compound_literal, we perform non-dependent expr folding before
the call to check_narrowing ever since r9-5973.  But ever since r10-7096,
check_narrowing also performs non-dependent expr folding of its own.
This double folding means tsubst will see non-templated trees during the
second folding, which causes a spurious error in the below testcase.

This patch removes the former folding operation; it seems obviated by
the latter one.

	PR c++/104565

gcc/cp/ChangeLog:

	* semantics.c (finish_compound_literal): Don't perform
	non-dependent expr folding before calling check_narrowing.

gcc/testsuite/ChangeLog:

	* g++.dg/template/non-dependent22.C: New test.

(cherry picked from commit 6bbd8afee0036c274f5ebb5b48d6fdc2091bd046)