cmd/compile/internal/ir: remove AsNode Except for a single call site in escape analysis, every use of ir.AsNode involves a types.Object that's known to contain an *ir.Name. Asserting directly to that type makes the code simpler and more efficient. The one use in escape analysis is extended to handle nil correctly without it. Change-Id: I694ae516903e541341d82c2f65a9155e4b0a9809 Reviewed-on: https://go-review.googlesource.com/c/go/+/520775 TryBot-Bypass: Matthew Dempsky <mdempsky@google.com> Run-TryBot: Matthew Dempsky <mdempsky@google.com> Auto-Submit: Matthew Dempsky <mdempsky@google.com> Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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