[5.2] Turn off speculative devirtualization by default. #29514
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This is a cherrypick of swiftlang#29359 Explanation: Disable speculative devirtualization optimization. The optimization did not give significant performance wins. Disabling it improves code size. Risk: Low. No significant performance hit is expected. Issue: rdar://problem/58778959 Testing: Performance tests and regression tests Reviewer: Erik Eckstein
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airspeedswift
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Jan 29, 2020
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This is a cherrypick of #29359
Explanation: Disable speculative devirtualization optimization. The
optimization did not give significant performance wins. Disabling it
improves code size.
Risk: Low. No significant performance hit is expected.
Issue: rdar://problem/58778959
Testing: Performance tests and regression tests
Reviewer: Erik Eckstein