support for large constants

It was not as simple as I thought.  All constants
used in 32b context get truncated to 32 bits.
All constants in 64b contexts can either remain
as immutables are have to be evicted in a register,
this choice is taken in noimm().  The case of the
comparison needs to be documented since the context
is not clearly 32 or 64 bits.

I am still unsure if this is fully correct.

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