Add tests

examples/ir1/switch.ir

@@ -0,0 +1,41 @@
+
+fun i32 @main () {
+init:
+  bid: b0
+  allocations: 
+    %l0:i32:a
+    %l1:i32:b
+
+block b0:
+  %b0:i0:unit = store 1:i32 %l0:*i32
+  %b0:i1:unit = store 0:i32 %l1:*i32
+  %b0:i2:i32 = load %l0:*i32
+  switch %b0:i2:i32 default b4() [
+    0:i32 b2()
+    1:i32 b3()
+  ]
+
+block b1:
+  %b1:i0:i32 = load %l1:*i32
+  %b1:i1:u1 = cmp eq %b1:i0:i32 2:i32
+  %b1:i2:i32 = typecast %b1:i1:u1 to i32
+  ret %b1:i2:i32
+
+block b2:
+  %b2:i0:i32 = load %l1:*i32
+  %b2:i1:i32 = add %b2:i0:i32 1:i32
+  %b2:i2:unit = store %b2:i1:i32 %l1:*i32
+  j b1()
+
+block b3:
+  %b3:i0:i32 = load %l1:*i32
+  %b3:i1:i32 = add %b3:i0:i32 2:i32
+  %b3:i2:unit = store %b3:i1:i32 %l1:*i32
+  j b1()
+
+block b4:
+  %b4:i0:i32 = load %l1:*i32
+  %b4:i1:i32 = add %b4:i0:i32 3:i32
+  %b4:i2:unit = store %b4:i1:i32 %l1:*i32
+  j b1()
+}