c-common.c (c_sizeof_or_alignof_type): Use fold_convert instead of building a NOP_EXPR.

	* c-common.c (c_sizeof_or_alignof_type): Use fold_convert instead
	of building a NOP_EXPR.
	(c_alignof_expr): Likewise.  Handle CONVERT_EXPR the same as
	NOP_EXPR.
	* c-convert.c (convert): Use fold_convert instead of building
	NOP_EXPRs and CONVERT_EXPRs directly.  Don't special case
	c_objc_common_truthvalue_conversion returning a NOP_EXPR.  Remove
	#if 0 code.
	* c-pretty-print.c (pp_c_cast_expression, pp_c_expression): Handle
	NOP_EXPR the same as CONVERT_EXPR.
	* c-typeck.c (build_function_call): Use fold_convert instead of
	building a NOP_EXPR directly.
	(build_compound_expr): Handle NOP_EXPR the same as CONVERT_EXPR.

testsuite:
	* gcc.dg/cast-pretty-print-1.c: New test.

From-SVN: r108001