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cmd/compile: internal compiler error: MoveLoop too small [1.26 backport] #81295

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@gopherbot

@randall77 requested issue #81240 to be considered for backport to the next 1.26 minor release.

@gopherbot Please open backport issues.

This original report is not really strong motivation, as it is an ICE that is happening before we would otherwise report a "stack frame too big" error.
But this could be more insidious. For large types (>2GB?), at certain sizes the compiler will silently incompletely zero or copy those types. Such types are probably really rare, but we should either compile them correctly, or barf somehow. Compiling them incorrectly is pretty bad.

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

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