re PR c++/160 (Reference variables not initialized correctly in constructor initializer list using , operator)

cp:
	PR c++/160
	* typeck.c (build_modify_expr): Remove old unreachable code & tidy
	up. Don't stabilize_references when initializing a reference.
testsuite:
	* g++.dg/other/init2.C: New test.

From-SVN: r48307