[dev.regabi] cmd/compile: remove some unneeded code in package ir

The deepCopy functions haven't been needed since we switched to using
Edit everywhere, and AddStringExpr no longer has an Alloc field that
needs special casing.

Passes toolstash -cmp.

Change-Id: I5bcc8c73d5cb784f7e57fb3162ae6e288e6c9392
Reviewed-on: https://go-review.googlesource.com/c/go/+/280445
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>

2 files changed, 0 insertions, 32 deletions

diff --git a/src/cmd/compile/internal/ir/mknode.go b/src/cmd/compile/internal/ir/mknode.go
index bc6fa3cd30..5c36b729c7 100644
--- a/src/cmd/compile/internal/ir/mknode.go
+++ b/src/cmd/compile/internal/ir/mknode.go
@@ -169,10 +169,6 @@ func forNodeFields(typName string, typ *types.Struct, f func(name string, is fun
 		case "orig":
 			continue
 		}
-		switch typName + "." + v.Name() {
-		case "AddStringExpr.Alloc":
-			continue
-		}
 		f(v.Name(), func(t types.Type) bool { return types.Identical(t, v.Type()) })
 	}
 }
diff --git a/src/cmd/compile/internal/ir/type.go b/src/cmd/compile/internal/ir/type.go
index 5e6d76229d..bd3a05d06e 100644
--- a/src/cmd/compile/internal/ir/type.go
+++ b/src/cmd/compile/internal/ir/type.go
@@ -115,14 +115,6 @@ func (n *StructType) SetOTYPE(t *types.Type) {
 	n.Fields = nil
 }
 
-func deepCopyFields(pos src.XPos, fields []*Field) []*Field {
-	var out []*Field
-	for _, f := range fields {
-		out = append(out, f.deepCopy(pos))
-	}
-	return out
-}
-
 // An InterfaceType represents a struct { ... } type syntax.
 type InterfaceType struct {
 	miniType
@@ -250,26 +242,6 @@ func editFields(list []*Field, edit func(Node) Node) {
 	}
 }
 
-func (f *Field) deepCopy(pos src.XPos) *Field {
-	if f == nil {
-		return nil
-	}
-	fpos := pos
-	if !pos.IsKnown() {
-		fpos = f.Pos
-	}
-	decl := f.Decl
-	if decl != nil {
-		decl = DeepCopy(pos, decl).(*Name)
-	}
-	ntype := f.Ntype
-	if ntype != nil {
-		ntype = DeepCopy(pos, ntype).(Ntype)
-	}
-	// No keyed literal here: if a new struct field is added, we want this to stop compiling.
-	return &Field{fpos, f.Sym, ntype, f.Type, f.Embedded, f.IsDDD, f.Note, decl}
-}
-
 // A SliceType represents a []Elem type syntax.
 // If DDD is true, it's the ...Elem at the end of a function list.
 type SliceType struct {