[COMMITTED] PR tree-optimization/106621 - Check for undefined and varying first.

[Andrew MacLeod]

We treat POLY_INT_CSTs as VARYING, but the check in irange::set for them 
was occurring after we called irange::set_range.  This patch merely 
shuffles the orders of checks around such that we check for undefined, 
and then varying/polyints before the other cases.  Performance impact is 
negligible.

bootstraps on 86_64-pc-linux-gnu with no regressions. Compilation 
reproduced the PR and patch passes the test on a cross compiler for 
aarch64.  I have no access to bootstrap on aarch64. Hopefully the 
testcase works as provided :)

pushed.

Andrew

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