effective go: extract and test a couple more examples.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/4937045
diff --git a/doc/progs/run b/doc/progs/run
index b60fdd7..7bff2cc 100755
--- a/doc/progs/run
+++ b/doc/progs/run
@@ -35,7 +35,9 @@
 	sieve1.go \
 	server1.go \
 	strings.go \
+	eff_bytesize.go\
 	eff_qr.go \
+	eff_sequence.go\
 ; do
 	$GC $i
 done
@@ -83,4 +85,7 @@
 $GC server.go
 testit server1 "" ""
 
+testit eff_bytesize "" "1.00YB 9.09TB"
+testit eff_sequence "" "[-1 2 6 16 44]"
+
 rm -f $O.out *.$O