warn-access: Fix handling of unnamed types [PR109804]

This looks like an oversight of handling DEMANGLE_COMPONENT_UNNAMED_TYPE.
DEMANGLE_COMPONENT_UNNAMED_TYPE only has the u.s_number.number set while
the code expected newc.u.s_binary.left would be valid.
So this treats DEMANGLE_COMPONENT_UNNAMED_TYPE like we treat function paramaters
(DEMANGLE_COMPONENT_FUNCTION_PARAM) and template paramaters (DEMANGLE_COMPONENT_TEMPLATE_PARAM).

Note the code in the demangler does this when it sets DEMANGLE_COMPONENT_UNNAMED_TYPE:
      ret->type = DEMANGLE_COMPONENT_UNNAMED_TYPE;
      ret->u.s_number.number = num;

Committed as obvious after bootstrap/test on x86_64-linux-gnu

	PR tree-optimization/109804

gcc/ChangeLog:

	* gimple-ssa-warn-access.cc (new_delete_mismatch_p): Handle
	DEMANGLE_COMPONENT_UNNAMED_TYPE.

gcc/testsuite/ChangeLog:

	* g++.dg/warn/Wmismatched-new-delete-8.C: New test.

Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>