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cmd/compile: Bug in rewrite rules for AMD64 causes SHL instruction overflow and miscompilation [1.26 backport] #79191

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@gopherbot

@Jorropo requested issue #79182 to be considered for backport to the next 1.26 minor release.

cc @gopherbot please open backport issues for 1.25 and 1.26

This is a misscompilation which was added in cd595be.

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    CherryPickCandidateUsed during the release process for point releasescompiler/runtimeIssues related to the Go compiler and/or runtime.

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