Crash in MapStablehloToScalarOp when bitcast_convert is lowered with quantized type.

[tlsdmstn56]

What happened?

https://github.com/openxla/stablehlo/blob/main/stablehlo/conversions/linalg/transforms/MapStablehloToScalarOp.h#L824-L825

Crash these lines if operand or result is quantized type because it is neither integral or float type.

Steps to reproduce your issue

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Version information

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