Add optimized ir examples

examples/opt/foo2.ir

@@ -0,0 +1,22 @@
+
+fun i32 @main () {
+init:
+  bid: b0
+  allocations: 
+
+
+block b0:
+  j b2(0:i32)
+
+block b2:
+  %b2:p0:i32:i
+  %b2:i0:u1 = cmp lt %b2:p0:i32 10:i32
+  br %b2:i0:u1, b3(), b5()
+
+block b3:
+  %b3:i0:i32 = add %b2:p0:i32 1:i32
+  j b2(%b3:i0:i32)
+
+block b5:
+  ret 1:i32
+}