Add an IR test for in tuple/list literal

Author: Johan Dahlin

mypyc/test-data/irbuild-tuple.test

@@ -193,3 +193,38 @@ L2:
     r4 = CPySequenceTuple_GetItem(nt, r3)
     r5 = unbox(int, r4)
     return r5
+[case testTupleOperatorIn]
+def f(i: int) -> bool:
+    return i in [1, 2, 3]
+[out]
+def f(i):
+    i :: int
+    r0, r1 :: bool
+    r2 :: short_int
+    r3 :: bool
+    r4 :: short_int
+    r5 :: bool
+    r6 :: short_int
+    r7 :: bool
+L0:
+    r2 = 1
+    r3 = i == r2 :: int
+    if r3 goto L1 else goto L2 :: bool
+L1:
+    r1 = r3
+    goto L3
+L2:
+    r4 = 2
+    r5 = i == r4 :: int
+    r1 = r5
+L3:
+    if r1 goto L4 else goto L5 :: bool
+L4:
+    r0 = r1
+    goto L6
+L5:
+    r6 = 3
+    r7 = i == r6 :: int
+    r0 = r7
+L6:
+    return r0