Assertion failure on LLVM >= 3.5

[Keno]

The recent call work has exposed an assertion failure in LLVM:

Assertion failed: ((I.atEnd() || std::next(I) == def_instr_end()) && "getVRegDef assumes a single definition or no definition"), function getVRegDef, file /Users/kfischer/julia/deps/llvm-svn/lib/CodeGen/MachineRegisterInfo.cpp, line 306 

Tracking upstream issue http://llvm.org/bugs/show_bug.cgi?id=21557 and patch at http://reviews.llvm.org/D6245. If we want to support 3.5, we'll probably have to backport the patch.
Just filling this issue so people running into it can find it when searching.

[ViralBShah]

Is our current plan to move to LLVM 3.5 with our own patches, or to wait for LLVM 3.6?

[tkelman]

Any patches we want to try to backport in LLVM before 3.5.1, we have about a week: http://article.gmane.org/gmane.comp.compilers.llvm.devel/78752

[Keno]

Committed upstream as http://reviews.llvm.org/rL224884 with a followup fix in http://reviews.llvm.org/rL22490.