x86: Add pal_pred AVX2 asm

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Status Job ID Name Coverage
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passed #4302
amd64 debian
build-debian

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debian aarch64
build-debian-aarch64

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debian clang5 aarch64
build-debian-aarch64-clang-5

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amd64 debian
build-debian-static

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macos
build-macos

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win32
build-win32

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build-win64

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