[arm] Explicitly set .fpu in cmse_nonsecure_call.S

This file is missing a .fpu directive and was relying on the compiler
driver passing through a -mfpu= command line option.  When the FPU is
auto, that will not be passed through correctly, so set something
suitable within the file itself.

libgcc:
	 * config/arm/cmse_nonsecure_call.S: Explicitly set the FPU.

From-SVN: r249297

libgcc/ChangeLog

+2017-06-16  Richard Earnshaw  <rearnsha@arm.com>
+
+	* config/arm/cmse_nonsecure_call.S: Explicitly set the FPU.
+
 2017-06-09  Martin Liska  <mliska@suse.cz>
 
 	* libgcov-profiler.c (__gcov_indirect_call_profiler_v2):

libgcc/config/arm/cmse_nonsecure_call.S

@@ -24,6 +24,14 @@
    <http://www.gnu.org/licenses/>.  */
 
 .syntax unified
+#ifdef __ARM_PCS_VFP
+# if __ARM_FP & 0x8
+	.fpu fpv5-d16
+# else
+	.fpu fpv4-sp-d16
+# endif
+#endif
+
 .thumb
 .global __gnu_cmse_nonsecure_call
 __gnu_cmse_nonsecure_call: