Delete chlo.dynamic_reshape and downstream ops
Delete chlo.dynamic_reshape and downstream ops

The downstream ops are [ms]hlo.{compute_reshape_shape,cstr_reshapable}.

The pattern that goes from tf.reshape to chlo.dynamic_reshape appears to be
dead code, and it is the only use of chlo.dynamic_reshape.

compute_reshape_shape and cstr_reshapable do not seem to be generated anywhere,
except when expanding chlo.dynamic_reshape.

Context: https://github.com/openxla/stablehlo/blob/main/rfcs/20230704-dynamism-101.md#p1
