RISC-V: Add support for riscv-*-*.

	* config.gcc (riscv*-*-*): When setting xlen, handle riscv-*.

From-SVN: r262463

gcc/ChangeLog

+2018-07-05  Jim Wilson  <jimw@sifive.com>
+
+	* config.gcc (riscv*-*-*): When setting xlen, handle riscv-*.
+
 2018-07-05  Indu Bhagat  <indu.bhagat@oracle.com> 
 
 	* config/aarch64/aarch64-simd.md: correct flags text for 

gcc/config.gcc

@@ -4091,7 +4091,7 @@ case "${target}" in
 		supported_defaults="abi arch tune"
 
 		case "${target}" in
-		riscv32*) xlen=32 ;;
+		riscv-* | riscv32*) xlen=32 ;;
 		riscv64*) xlen=64 ;;
 		*) echo "Unsupported RISC-V target ${target}" 1>&2; exit 1 ;;
 		esac