[TVMScript] Support SizeVar Roundtripping #14227
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Previously the printer does not respect the difference between tir.Var
and tir.SizeVar, which means SizeVar info will be lost during
roundtripping, which is not ideal when dealing with dynamic shape
workloads, where SizeVar provides additional bound information to the
arithmetic analyzer.
This PR extends Var printing to support SizeVar:
```python
>>> a = tir.SizeVar("a", "int32")
>>> print(a.script(verbose_expr=True))
a = T.int32(is_size_var=True)
a
```
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Previously the printer does not respect the difference between tir.Var and tir.SizeVar, which means SizeVar info will be lost during roundtripping, which is not ideal when dealing with dynamic shape workloads, where SizeVar provides additional bound information to the arithmetic analyzer.
This PR extends Var printing to support SizeVar: