[llvm-dev] Early CSE clobbering llvm.assume

[Josh Klontz via llvm-dev]

As of llvm 3.8, the early CSE pass seems to remove llvm.assume intrinsics.
Is this the expected behavior?

I've attached as small-ish example of this happening in my production code.

    $ opt -early-cse before-early-cse.ll -S > after-early-cse.ll

Note the use of the assume intrinsic indicating that the loaded value
%channels equals 3. In a later pass I replace the load instruction with the
constant value. This approach worked in llvm 3.7. I can solve the issue by
moving my pass before early CSE if need be.

v/r,
Josh
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