Drop range inference for IS_NULL/IS_FALSE/IS_TRUE.

These values not always converted to IS_LONG (e.g. by -- and ++) and
this leads to incorrect range inferene and later to incorrect JIT

Drop range inference for IS_NULL/IS_FALSE/IS_TRUE.

These values not always converted to IS_LONG (e.g. by -- and ++) and
this leads to incorrect range inferene and later to incorrect JIT code
generation.

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