cmd/compile/internal/staticinit: fix panic in interface conversion
This patch fixes a panic from incorrect interface conversion from
*ir.BasicLit to *ir.ConstExpr. This only occurs when nounified
GOEXPERIMENT is set, so ideally it should be backported to Go
1.20 and removed from master.
Fixes #58339
Change-Id: I357069d7ee1707d5cc6811bd2fbdd7b0456323ae
GitHub-Last-Rev:
641dedb5f9f95e6f8d46723d445a8c9609719ce4
GitHub-Pull-Request: golang/go#58389
Reviewed-on: https://go-review.googlesource.com/c/go/+/466175
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@google.com>