[PATCH] Enhance initial global ranges.

[Andrew MacLeod]

Add some tweaks to gimple_range_global () that

1) incorporates code from vr-values to pick up initial parameter values 
from IPA,

2) used before defined locals start with UNDEFINED instead of varying.  
This makes a big difference when folding PHI nodes.

Bootstraps on  x86_64-pc-linux-gnu with no testsuite regressions.

Pushed.

Andrew


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