cmd/compile: prepare TFlag before SSA folding Computing a runtime type's TFlag requires its method set to have been prepared. Structurally identical types can share wrapper generation without sharing this per-Type state. Cache TFlag after the existing method preparation in MakeWrappers, and copy the cached value when wrapper generation deduplicates identical types. Fixes #81354 Change-Id: I3d97f9054b5e4e3308696a949285fa66a259ed1c Reviewed-on: https://go-review.googlesource.com/c/go/+/827704 Reviewed-by: PJ Malloy <pjmalloy@google.com> Reviewed-by: Keith Randall <khr@google.com> Auto-Submit: Jake Bailey <jacob.b.bailey@gmail.com> LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Keith Randall <khr@golang.org>
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