coroutines : Call promise CTOR with parm copies [PR97587].
As the PR notes, we were calling the promise CTOR with the original
function parameters, not the copy (as pointed, a previous wording of
the section was unambiguous). Fixed thus.
gcc/cp/ChangeLog:
PR c++/97587
* coroutines.cc (struct param_info): Track rvalue refs.
(morph_fn_to_coro): Track rvalue refs, and call the promise
CTOR with the frame copy of passed parms.
gcc/testsuite/ChangeLog:
PR c++/97587
* g++.dg/coroutines/coro1-refs-and-ctors.h: Add a CTOR with two
reference parms, to distinguish the rvalue ref. variant.
* g++.dg/coroutines/pr97587.C: New test.