[10/11] Expander fixes for 40-bit integers

[Bernd Schmidt]

This fixes a few random problems that occur when you add a new
fractional integer mode - for example, trying to expand doubleword
shifts normally for them, or trying to generate 40->64 bit widening
multiply. In some cases where it seems we can only deal with modes where
precision == bitsisze, I've added asserts.


Bernd

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