Rename the arenas.extend mallctl to arenas.create.

test/integration/MALLOCX_ARENA.c

@@ -19,8 +19,8 @@ thd_start(void *arg)
 	size_t sz;
 
 	sz = sizeof(arena_ind);
-	assert_d_eq(mallctl("arenas.extend", (void *)&arena_ind, &sz, NULL, 0),
-	    0, "Error in arenas.extend");
+	assert_d_eq(mallctl("arenas.create", (void *)&arena_ind, &sz, NULL, 0),
+	    0, "Error in arenas.create");
 
 	if (thread_ind % 4 != 3) {
 		size_t mib[3];

test/integration/extent.c

@@ -292,7 +292,7 @@ TEST_BEGIN(test_extent_manual_hook)
 	size_t hooks_miblen;
 
 	sz = sizeof(unsigned);
-	assert_d_eq(mallctl("arenas.extend", (void *)&arena_ind, &sz, NULL, 0),
+	assert_d_eq(mallctl("arenas.create", (void *)&arena_ind, &sz, NULL, 0),
 	    0, "Unexpected mallctl() failure");
 
 	/* Install custom extent hooks. */
@@ -354,7 +354,7 @@ TEST_BEGIN(test_extent_auto_hook)
 
 	sz = sizeof(unsigned);
 	new_size = sizeof(extent_hooks_t *);
-	assert_d_eq(mallctl("arenas.extend", (void *)&arena_ind, &sz,
+	assert_d_eq(mallctl("arenas.create", (void *)&arena_ind, &sz,
 	    (void *)&new_hooks, new_size), 0, "Unexpected mallctl() failure");
 
 	test_extent_body(arena_ind);

test/integration/xallocx.c

@@ -16,7 +16,7 @@ arena_ind(void)
 
 	if (ind == 0) {
 		size_t sz = sizeof(ind);
-		assert_d_eq(mallctl("arenas.extend", (void *)&ind, &sz, NULL,
+		assert_d_eq(mallctl("arenas.create", (void *)&ind, &sz, NULL,
 		    0), 0, "Unexpected mallctl failure creating arena");
 	}