Fix PR31183 in tree-loop-linear

[Sebastian Pop]

Hi,

Here is a fix that uses host_integerp () for checking that the
strides and the array sizes fit in HWI.  I also have modified the
types for the other integer variables to HWI.
I'm testing the attached patch on i386-apple-darwin8.8.1.
Okay for trunk after bootstrap and test?

Sebastian
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