ARCv2: optimised string/mem lib routines

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

arch/arc/lib/Makefile

@@ -5,5 +5,7 @@
 # it under the terms of the GNU General Public License version 2 as
 # published by the Free Software Foundation.
 
-lib-y	:= strchr-700.o strcmp.o strcpy-700.o strlen.o
-lib-y	+= memcmp.o memcpy-700.o memset.o
+lib-y	:= strchr-700.o strcpy-700.o strlen.o memcmp.o
+
+lib-$(CONFIG_ISA_ARCOMPACT)	+= memcpy-700.o memset.o strcmp.o
+lib-$(CONFIG_ISA_ARCV2)		+= memcpy-archs.o memset-archs.o strcmp-archs.o