[AArch64] Extra scalar_float_mode patch

In preparation for the switch to NUM_POLY_INT_COEFFS==2.

2018-01-11  Richard Sandiford  <richard.sandiford@linaro.org>

gcc/
	* config/aarch64/aarch64.c (aarch64_reinterpret_float_as_int):
	Use scalar_float_mode.

From-SVN: r256531

gcc/ChangeLog

 2018-01-11  Richard Sandiford  <richard.sandiford@linaro.org>
 
+	* config/aarch64/aarch64.c (aarch64_reinterpret_float_as_int):
+	Use scalar_float_mode.
+
+2018-01-11  Richard Sandiford  <richard.sandiford@linaro.org>
+
 	* config/aarch64/aarch64-simd.md
 	(aarch64_fml<f16mac1>l<f16quad>_low<mode>): Avoid GET_MODE_NUNITS.
 	(aarch64_fml<f16mac1>l<f16quad>_high<mode>): Likewise.

gcc/config/aarch64/aarch64.c

@@ -4806,9 +4806,9 @@ aarch64_reinterpret_float_as_int (rtx value, unsigned HOST_WIDE_INT *intval)
       return true;
     }
 
-  machine_mode mode = GET_MODE (value);
+  scalar_float_mode mode;
   if (GET_CODE (value) != CONST_DOUBLE
-      || !SCALAR_FLOAT_MODE_P (mode)
+      || !is_a <scalar_float_mode> (GET_MODE (value), &mode)
       || GET_MODE_BITSIZE (mode) > HOST_BITS_PER_WIDE_INT
       /* Only support up to DF mode.  */
       || GET_MODE_BITSIZE (mode) > GET_MODE_BITSIZE (DFmode))