Add optimized ir examples

examples/opt/fibonacci.ir

@@ -0,0 +1,37 @@
+var i32 @nonce = 1
+
+fun i32 @fibonacci (i32) {
+init:
+  bid: b0
+  allocations: 
+
+
+block b0:
+  %b0:p0:i32:n
+  %b0:i0:u1 = cmp lt %b0:p0:i32 2:i32
+  br %b0:i0:u1, b1(), b2()
+
+block b1:
+  ret %b0:p0:i32
+
+block b2:
+  %b2:i0:i32 = sub %b0:p0:i32 2:i32
+  %b2:i1:i32 = call @fibonacci:[ret:i32 params:(i32)]*(%b2:i0:i32)
+  %b2:i2:i32 = sub %b0:p0:i32 1:i32
+  %b2:i3:i32 = call @fibonacci:[ret:i32 params:(i32)]*(%b2:i2:i32)
+  %b2:i4:i32 = add %b2:i1:i32 %b2:i3:i32
+  ret %b2:i4:i32
+}
+
+fun i32 @main () {
+init:
+  bid: b0
+  allocations: 
+
+
+block b0:
+  %b0:i0:i32 = load @nonce:i32*
+  %b0:i1:i32 = mod %b0:i0:i32 20:i32
+  %b0:i2:i32 = call @fibonacci:[ret:i32 params:(i32)]*(%b0:i1:i32)
+  ret %b0:i2:i32
+}