[llvm] MemorySSA patch for 3.9

[George Burgess IV via llvm-commits]

Hi Hans,

Can we please apply the attached patch to the 3.9 branch? It fixes PR28632,
which is a release blocker.

It doesn't apply to trunk, because we entirely replaced the piece of code
that this patch "fixes" in r275940.

(I realize that fixing an assertion failure by removing the assertion looks
kind of bad, but said assertion was really more of a warning that we've hit
a pathological-ish case than an error. ;) )

Thank you!
George
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