cmd/compile: invalid instruction: MOVL $11553462026240, AX [1.15 backport]

[gopherbot]

@randall77 requested issue #41711 to be considered for backport to the next 1.15 minor release.

@gopherbot please open a backport issue for 1.15.

[gopherbot]

Change https://golang.org/cl/258817 mentions this issue: [release-branch.go1.15] cmd/compile: fix left shift constant folding rule

[randall77]

This issue causes a rare compiler ICE.

[dmitshur]

Approving per discussion in a release meeting as a serious issue without a workaround. Only Go 1.15 needs this backport.

[gopherbot]

Closed by merging 7863f74 to release-branch.go1.15.