Update examples with new testcase

examples/opt/sizeof4.ir

@@ -0,0 +1,12 @@
+
+fun i32 @main () {
+init:
+  bid: b0
+  allocations: 
+
+
+block b0:
+  %b0:i0:i32 = typecast 4:u64 to i32
+  %b0:i1:i32 = add 3:i32 %b0:i0:i32
+  ret %b0:i1:i32
+}