c++, coroutines: Rework handling of throwing_cleanups [PR102051].

In the fix for PR95822 (r11-7402) we set throwing_cleanup false in the top
level of the coroutine transform code.  However, as the current PR shows,
that is not sufficient.

Any use of cxx_maybe_build_cleanup() can reset the flag, which causes the
check_return_expr () logic to try to add a guard variable and set it.

For the coroutine code, we need to handle the cleanups separately, since
the responsibility for them changes after the first resume point, which
we handle in the ramp exception processing.

Fix this by forcing the "throwing_cleanup" flag false right before the
processing of the return expression.

	PR c++/102051

gcc/cp/ChangeLog:

	* coroutines.cc
	(cp_coroutine_transform::build_ramp_function): Handle
	"throwing_cleanup" here instead of ...
	(cp_coroutine_transform::apply_transforms): ... here.

gcc/testsuite/ChangeLog:

	* g++.dg/coroutines/pr102051.C: New test.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>

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