add info about Sqrt instruction

couple of fixes to timing.sh

R=rsc
DELTA=10  (5 added, 0 deleted, 5 changed)
OCL=32742
CL=32756

test/bench/timing.log

@@ -34,3 +34,7 @@ nbody 50000000
 	gccgo -O2 nbody.go	118.55u 0.02s 120.32r
 	gc nbody	100.84u 0.00s 100.85r
 	gc_B nbody	103.33u 0.00s 103.39r
+[
+hacked Sqrt in assembler
+	gc nbody	31.97u 0.00s 32.01r
+]

test/bench/timing.sh

@@ -30,12 +30,13 @@ fasta() {
 }
 
 revcomp() {
-	6.out -n 25000000 > x
+	gcc -O2 fasta.c
+	a.out 25000000 > x
 	echo 'reverse-complement < output-of-fasta-25000000'
-	run 'gcc -O2 reverse-complement.c' a.out 25000000 < x
-	run 'gccgo -O2 reverse-complement.go' a.out -n 25000000 < x
-	run 'gc reverse-complement' $O.out -n 25000000 < x
-	run 'gc_B reverse-complement' $O.out -n 25000000 < x
+	run 'gcc -O2 reverse-complement.c' a.out < x
+	run 'gccgo -O2 reverse-complement.go' a.out < x
+	run 'gc reverse-complement' $O.out < x
+	run 'gc_B reverse-complement' $O.out < x
 	rm x
 }