New issue 2569: Teach the JIT about frozenset immutability
https://bitbucket.org/pypy/pypy/issues/2569/teach-the-jit-about-frozenset-immutability
Antonio Cuni:
The JIT does not take advantage of frozenset immutability. E.g. consider this
case:
```
TUP = ('foo', 'bar', 'baz')
FROZ = frozenset(TUP)
def main():
x = 0
for i in range(2000):
x += 'foo' in TUP
x += 'foo' in FROZ
main()
```
The JIT can constat-fold the TUP lookup but not the FROZ one.
Looking at the code, `W_FrozensetObject` lacks `_immutable_fields_`, but I'm
not sure whether more is needed to achieve it.
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