PR target/35366
	PR fortran/33759
	* fold-const.c (native_encode_string): New function.
	(native_encode_expr): Use it for STRING_CST.

	* trans-const.c (gfc_conv_constant_to_tree): Warn when
	converting an integer outside of LOGICAL's range to
	LOGICAL.
	* trans-intrinsic.c (gfc_conv_intrinsic_function,
	gfc_conv_intrinsic_array_transfer, gfc_conv_intrinsic_transfer):
	Use INTEGER_TYPE instead of BOOLEAN_TYPE for TRANSFER as
	argument of another TRANSFER.

	* gfortran.dg/hollerith.f90: Don't assume a 32-bit value
	stored into logical variable will be preserved.
	* gfortran.dg/transfer_simplify_4.f90: Remove undefined
	cases.  Run at all optimization levels.  Add a couple of
	new tests.
	* gfortran.dg/hollerith5.f90: New test.
	* gfortran.dg/hollerith_legacy.f90: Add dg-warning.

From-SVN: r141790