[TESTSUITE]Use memcpy instead of strcpy in testsuite/gcc.dg/memcmp-1.c

strcpy will keep reading and writing memory if the string is not terminated
with null character. In this case, it may visit memory beyond the boundary.

gcc/testsuite/

2017-08-31  Renlin Li  <renlin.li@arm.com>
	    Aaron Sawdey  <acsawdey@linux.vnet.ibm.com>

	* gcc.dg/memcmp-1.c (test_strncmp): Use memcpy instead of strcpy.


Co-Authored-By: Aaron Sawdey <acsawdey@linux.vnet.ibm.com>

From-SVN: r251554

gcc/testsuite/ChangeLog

+2017-08-31  Renlin Li  <renlin.li@arm.com>
+	    Aaron Sawdey  <acsawdey@linux.vnet.ibm.com>
+
+	* gcc.dg/memcmp-1.c: Use memcpy instead of strcpy.
+
 2017-08-30  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>
 
 	PR tree-optimization/81987

gcc/testsuite/gcc.dg/memcmp-1.c

@@ -110,8 +110,8 @@ static void test_strncmp_ ## SZ ## _ ## ALIGN (const char *str1, const char *str
 	{								\
 	  a = three+i*ALIGN+j*(4096-2*i*ALIGN);				\
 	  b = four+i*ALIGN+j*(4096-2*i*ALIGN);				\
-	  strcpy(a,str1);						\
-	  strcpy(b,str2);						\
+	  memcpy(a,str1,SZ);						\
+	  memcpy(b,str2,SZ);						\
 	  r = strncmp(a,b,SZ);						\
 	  if ( r < 0 && !(expect < 0) ) abort();			\
 	  if ( r > 0 && !(expect > 0) )	abort();			\