Add tests

examples/ir3/simple_if.ir

@@ -0,0 +1,34 @@
+
+fun i32 @fibonacci (i32) {
+init:
+  bid: b0
+  allocations: 
+
+
+block b0:
+  %b0:i0:u1 = cmp lt %b0:p0:i32 2:i32
+  br %b0:i0:u1, b1(), b3(%b0:p0:i32)
+
+block b1:
+  %b1:i0:i32 = add %b0:p0:i32 2:i32
+  j b3(%b1:i0:i32)
+
+block b3:
+  %b3:p0:i32:n
+  %b3:i0:i32 = sub %b3:p0:i32 2:i32
+  %b3:i1:i32 = call @fibonacci:*[ret:i32 params:(i32)](%b3:i0:i32)
+  %b3:i2:i32 = sub %b3:p0:i32 1:i32
+  %b3:i3:i32 = call @fibonacci:*[ret:i32 params:(i32)](%b3:i2:i32)
+  %b3:i4:i32 = add %b3:i1:i32 %b3:i3:i32
+  ret %b3:i4:i32
+}
+
+fun i32 @main () {
+init:
+  bid: b0
+  allocations: 
+
+
+block b0:
+  ret 1:i32
+}