Minor VRP jump threading improvement

[Paolo Bonzini]

On 03/15/2011 10:37 PM, Jeff Law wrote:
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> I noticed that VRP was missing many obvious jump threading
> opportunities; investigation showed that it wasn't threading through
> conditionals with pointer types, just those with integral types.
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> Fix is rather obvious.
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> Bootstrapped and regression tested on x86_64-unknown-linux-gnu.  OK for
> trunk?

Do you have a testcase to include?

Paolo