c++: Invisible refs are not restrict [PR97474]

c++: Invisible refs are not restrict [PR97474]

In this testcase, we refer to the a parameter through a reference in its own
member, which we asserted couldn't happen by marking the parameter as
'restrict'.  This assumption could also be broken if the address escapes
from the constructor.

gcc/cp/ChangeLog:

	PR c++/97474
	* call.c (type_passed_as): Don't mark invisiref restrict.

gcc/testsuite/ChangeLog:

	PR c++/97474
	* g++.dg/torture/pr97474.C: New test.