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RFA: Improve jump threading #2 of N

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For some dumb reason I thought handling threading through a SWITCH_EXPR
was hard in VRP; that's definitely not the case, it's no more difficult
than handling a COND_EXPR.

This patch allows tree-vrp.c to thread through a SWITCH_EXPR when we
know the switch index via a particular path.  Most of these would have
eventually been caught by DOM, but we get to pick up more secondary
effects if we can catch them in VRP.

Bootstrapped and regression tested on x86_64-unknown-linux-gnu.  OK for
trunk?




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