[LLVMdev] Strong PHI elimination asserts in RegisterCoalescer.C:1388

[Andrew Clinton]

I've started using the strong PHI elimination pass, and it seems to work 
beautifully (producing much better placement of copy instructions) - 
though I'm seeing that it triggers an assert in debug+assert builds.  
The assertion is on line 1388 of RegisterCoalescer.C.  Attached is the 
-debug output from the machine optimization part of the optimizer, for 
the simplest test case I could create that triggers this behavior.

Any idea what might be going wrong?  Are there known issues with strong 
PHI elimination?

Andrew
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