Add codegen tests for fshr and clmul

[pvdrz]

• Add fshr test in codegen-llvm
• Add clmul test in codegen-llvm

[rustbot]

r? @Mark-Simulacrum

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[Mark-Simulacrum]

Why =1?

[pvdrz]

The carrying_mul_add test used opt-level 1 so I thought I'd use the same here

[Mark-Simulacrum]

Any reason not to call our wrapper around it instead?

[pvdrz]

same reason as the rotate_left test.

[Mark-Simulacrum]

Similarly, why isn't this best done via the wrappers?

[pvdrz]

This test was done by copying the rotate_left test. I don't know why this isn't done via the wrappers either. I only noticed that the rotate_right intrinsic didn't have any codegen tests.

[rustbot]

Reminder, once the PR becomes ready for a review, use @rustbot ready.

[pvdrz]

@rustbot ready

[rustbot]

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