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[NFC][PhaseOrdering] Add a test demonstrating pitfails of common code hoisting…

Authored by lebedev.ri on Jul 16 2020, 1:33 PM.

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[NFC][PhaseOrdering] Add a test demonstrating pitfails of common code hoisting on loop rotation

Depending on the -rotation-max-header-size=?,
hoisting common code early makes loop rotation impossible.

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Committed
lebedev.riJul 16 2020, 1:53 PM
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rG5408024fa87e: [X86] Move integer hadd/hsub formation into a helper function shared by…
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