Add tests

examples/ir0/typecast.ir

@@ -0,0 +1,19 @@
+var i8 @temp = 0x00l
+
+fun i32 @main () {
+init:
+  bid: b0
+  allocations: 
+
+
+block b0:
+  %b0:i0:i8 = typecast 61238:i64 to i8
+  %b0:i1:unit = store %b0:i0:i8 @temp:*i8
+  %b0:i2:i64 = typecast %b0:i0:i8 to i64
+  %b0:i3:u1 = cmp ge %b0:i2:i64 2:i64
+  %b0:i4:i32 = typecast %b0:i3:u1 to i32
+  ret %b0:i4:i32
+
+block b1:
+  ret 0:i32
+}