Bits and pieces on the bottom of the module dependency tree.
Also import the required constants, so we know what we're using.
In the interests of cross-compilation, we want to free ourselves
from the autoconf generated modules like main/Constants
|We need 8 bytes because our largest registers are 64 bit.
|We (allegedly) put the first six C-call arguments in registers;
where do we start putting the rest of them?
|Check whether an offset is representable with 13 bits.
|Check whether an integer will fit in 32 bits.
A CmmInt is intended to be truncated to the appropriate
number of bits, so here we truncate it to Int64. This is
important because e.g. -1 as a CmmInt might be either
-1 or 18446744073709551615.
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