cmd/compile: internal compiler error: method Len on *uint8 not found [1.19 backport]

[gopherbot]

@mdempsky requested issue #54225 to be considered for backport to the next 1.19 minor release.

@gopherbot Please backport to Go 1.19

[mdempsky]

The backport CL is https://go-review.googlesource.com/c/go/+/429895

It's intentionally minimally invasive to address the issue while minimizing risk of collateral damage.

Specifically, instead of hitting an ICE while emitting broken dictionary symbols, it changes the compiler to skip emitting those symbols instead. If the symbols are actually needed, the consequence is this just turns an ICE into a linker failure: no real harm.

But I believe in practice the broken symbols aren't actually needed in the final executable, and so the linker's reachability analysis will simply ignore the missing symbol.

[gopherbot]

Change https://go.dev/cl/429895 mentions this issue: [release-branch.go1.19] cmd/compile: skip emitting dictionaries with missing method expressions

[gopherbot]

Closed by merging 3747bb2 to release-branch.go1.19.