add efib benchmark

benchmarks/efib.nds

@@ -0,0 +1,13 @@
+
+var a = 0;
+var b = 1;
+var i = 1;
+
+while (i < 300) {
+  var c = a + b;
+  a = b;
+  b = c;
+  i = i + 1;
+};
+
+print b;

benchmarks/efib.py

@@ -0,0 +1,13 @@
+
+a = 0
+b = 1
+i = 1
+
+while i < 300:
+  c = a + b
+  a = b
+  b = c
+  i = i + 1
+
+
+print (b)

benchmarks/efib.sh

@@ -0,0 +1,13 @@
+x=0
+y=1
+i=2
+
+while [ $i -lt 300 ]
+do
+  i=$(( $i + 1 ))
+  z=$(( $x + $y ))
+  x=$y
+  y=$z
+done
+
+echo "$y"