[ARM] Mention ARMv8-R +fp.sp option

2017-07-13  Thomas Preud'homme  <thomas.preudhomme@arm.com>

    gcc/
    * doc/invoke.texi (armv8-r): Document +fp.sp ARMv8-R extension.

From-SVN: r250178

gcc/ChangeLog

+2017-07-13  Thomas Preud'homme  <thomas.preudhomme@arm.com>
+
+	* doc/invoke.texi (armv8-r): Document +fp.sp ARMv8-R extension.
+
 2017-07-13  Richard Earnshaw  <rearnsha@arm.com>
 
 	* config/arm/vxworks.h (TARGET_ENDIAN_DEFAULT): Define.

gcc/doc/invoke.texi

@@ -15493,6 +15493,8 @@ Disable the floating-point extension.
 @table @samp
 @item +crc
 The Cyclic Redundancy Check (CRC) instructions.
+@item +fp.sp
+The single-precision FPv5 floating-point instructions.
 @item +simd
 The ARMv8 Advanced SIMD and floating-point instructions.
 @item +crypto