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[x86] add more tests for LowerToHorizontalOp(); NFC

Description

[x86] add more tests for LowerToHorizontalOp(); NFC

These tests show missed optimizations and a miscompile
similar to PR40243 - https://bugs.llvm.org/show_bug.cgi?id=40243

Details

Committed
spatelJan 7 2019, 8:10 AM
Parents
rL350532: AMDGPU: test for uniformity of branch instruction, not its condition
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