Add tests

examples/ir4/integer_literal.ir

@@ -0,0 +1,17 @@
+
+fun i32 @main () {
+init:
+  bid: b0
+  allocations: 
+
+
+block b0:
+  %b0:i0:i16 = typecast 0:i32 to i16
+  %b0:i1:u32 = typecast %b0:i0:i16 to u32
+  %b0:i2:u32 = xor %b0:i1:u32 4294967163:u32
+  %b0:i3:i8 = typecast %b0:i2:u32 to i8
+  %b0:i4:i32 = typecast %b0:i3:i8 to i32
+  %b0:i5:u1 = cmp eq %b0:i4:i32 123:i32
+  %b0:i6:i32 = typecast %b0:i5:u1 to i32
+  ret %b0:i6:i32
+}