[COMMITTED] Turn hybrid mode off, default to ranger-only mode for EVRP.

[Andrew MacLeod]

With the integration of the relational oracle, Ranger is now pretty much 
at parity in getting all the cases EVRP use to, and runs the testsuite 
cleanly.

This patch turns hybrid mode off, running EVRP in ranger-only mode.  It 
requires a tweak to one test case which was XFAILing before, but now 
passes. This will hopefully be transparent to everyone.

With legacy evrp off, we'll see if anything shows up that I have missed 
in my analysis. Its certainly easy enough to turn back on if need be.  I 
will continue to locally monitor hybrid mode to ensure we don't lose any 
ground.

I have bootstrapped this on 3 arch's :  x86_64,  aarch64,  and 
powerpc64, and all run regression free through the testsuite.

pushed.

Andrew





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