cmd/compile: miscompile of global array initialization [1.26 backport]

[gopherbot]

@randall77 requested issue #77193 to be considered for backport to the next 1.26 minor release.

@gopherbot please open backport issues.

This bug can cause random crashes after constructing deep-ish array composite literals. Maybe heap corruption also? Not sure.

[gopherbot]

Change https://go.dev/cl/738420 mentions this issue: [release-branch.go1.24] cmd/compile: fix mis-compilation for static array initialization

[gopherbot]

Change https://go.dev/cl/738940 mentions this issue: [release-branch.go1.26] cmd/compile: fix mis-compilation for static array initialization

[gopherbot]

Closed by merging CL 738940 (commit 85050c9) to release-branch.go1.26.