target-supports.exp (check_effective_target_fixed_point): New to check if targets have fixed-point supports.

	* lib/target-supports.exp (check_effective_target_fixed_point): New to
	check if targets have fixed-point supports.
	* gcc.dg/fixed-point/fixed-point.exp: New file.
	* gcc.dg/fixed-point/addsub.c, gcc.dg/fixed-point/allconv.c,
	* gcc.dg/fixed-point/allop.c, gcc.dg/fixed-point/call-by-value.c,
	* gcc.dg/fixed-point/cast-bad.c, gcc.dg/fixed-point/composite-type.c,
	* gcc.dg/fixed-point/const-1.c, gcc.dg/fixed-point/constant.c,
	* gcc.dg/fixed-point/constants-pedantic.c,
	* gcc.dg/fixed-point/convert.c, gcc.dg/fixed-point/define.c,
	* gcc.dg/fixed-point/keywords-c89.c, gcc.dg/fixed-point/keywords-c99.c,
	* gcc.dg/fixed-point/keywords-ignored-c99.c,
	* gcc.dg/fixed-point/keywords-pedantic.c,
	* gcc.dg/fixed-point/keywords-reserved.c, gcc.dg/fixed-point/binary.c,
	* gcc.dg/fixed-point/modes.c, gcc.dg/fixed-point/noassoc.c,
	* gcc.dg/fixed-point/types.c, gcc.dg/fixed-point/typespec.c,
	* gcc.dg/fixed-point/unary.c, gcc.dg/fixed-point/func-array.c,
	* gcc.dg/fixed-point/func-scalar.c, gcc.dg/fixed-point/func-struct.c,
	* gcc.dg/fixed-point/func-vararg-mixed.c,
	* gcc.dg/fixed-point/operator-logical.c,
	* gcc.dg/fixed-point/struct-union.c,
	* gcc.dg/fixed-point/bit-complement.c,
	* gcc.dg/fixed-point/operator-bitwise.c,
	* gcc.dg/fixed-point/operator-comma.c,
	* gcc.dg/fixed-point/struct-layout-1.c,
	* gcc.dg/fixed-point/union-init.c,
	* gcc.dg/fixed-point/Wbad-function-cast-1.c,
	* gcc.dg/fixed-point/func-mixed.c,
	* gcc.dg/fixed-point/func-vararg-size0.c,
	* gcc.dg/fixed-point/func-vararg.c, gcc.dg/fixed-point/int-warning.c,
	* gcc.dg/fixed-point/loop-index.c, gcc.dg/fixed-point/operator-cond.c,
	* gcc.dg/fixed-point/operator-unary.c,
	* gcc.dg/fixed-point/allop-const.c,
	* gcc.dg/fixed-point/muldiv-warning.c,
	* gcc.dg/nofixed-point-1.c,
	* gcc.target/mips/dpaq_sa_l_w.c, gcc.target/mips/dpsq_sa_l_w.c,
	* gcc.target/mips/fixed-vector-type.c,
	* gcc.target/mips/fixed-scalar-type.c: New tests.

From-SVN: r128661