cmd/compile: internal compiler error: panic: interface conversion: ir.Node is *ir.IndexExpr, not *ir.StarExpr [1.26 backport]

[gopherbot]

@randall77 requested issue #77832 to be considered for backport to the next 1.26 minor release.

@gopherbot Please open a backport issue for 1.26.

[gopherbot]

Change https://go.dev/cl/749680 mentions this issue: [release-branch.go1.26] cmd/compile: fix bloop test

[gopherbot]

Change https://go.dev/cl/751240 mentions this issue: [release-branch.go1.26] cmd/compile: fix bloop test