[Bug 84232] PHINode containing itself causes segfault in LLVM when compiling Blender OpenCL kernel with R600 backend

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Comment # 12 on bug 84232 from
Hm... Checked the test from comment 6, the result is the same - there are two
PHINode loops and one branch on constant.

Also checked the code, it looks like crash from comment 6 is also triggered by
a branch-on-constant, the difference is that it crashes when a ConstantInt is
dyn_cast<>'ed to incorrect class - Instruction (ConstantInt isn't an
Instruction!!) in handleLoopCondition() and getTerminator() is called on it.


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