PR c++/34198
	* c-common.c (conversion_warning): For INTEGER_TYPE to
	INTEGER_TYPE conversions call get_narrower on expr to avoid
	spurious warnings from binop shortening or when the implicit
	conversion can't change the value.

	* gcc.dg/Wconversion-5.c: New test.
	* g++.dg/Wconversion3.C: New test.

From-SVN: r130377