cmd/compile/internal/noder: remove wrapName

The OPARENs inserted here used to be necessary for better error
diagnostics, but now those are handled by types2.

Change-Id: I88d50d34d9e00cdd7d0fb32f6e460a179345a787
Reviewed-on: https://go-review.googlesource.com/c/go/+/573115
Auto-Submit: Matthew Dempsky <[email protected]>
Reviewed-by: Than McIntosh <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>

Author: mdempsky

src/cmd/compile/internal/noder/reader.go

@@ -2965,7 +2965,7 @@ func (r *reader) compLit() ir.Node {
 			*elemp, elemp = kv, &kv.Value
 		}
 
-		*elemp = wrapName(r.pos(), r.expr())
+		*elemp = r.expr()
 	}
 
 	lit := typecheck.Expr(ir.NewCompLitExpr(pos, ir.OCOMPLIT, typ, elems))
@@ -2980,23 +2980,6 @@ func (r *reader) compLit() ir.Node {
 	return lit
 }
 
-func wrapName(pos src.XPos, x ir.Node) ir.Node {
-	// These nodes do not carry line numbers.
-	// Introduce a wrapper node to give them the correct line.
-	switch x.Op() {
-	case ir.OTYPE, ir.OLITERAL:
-		if x.Sym() == nil {
-			break
-		}
-		fallthrough
-	case ir.ONAME, ir.ONONAME, ir.ONIL:
-		p := ir.NewParenExpr(pos, x)
-		p.SetImplicit(true)
-		return p
-	}
-	return x
-}
-
 func (r *reader) funcLit() ir.Node {
 	r.Sync(pkgbits.SyncFuncLit)
 

src/cmd/compile/internal/noder/writer.go

@@ -2304,7 +2304,6 @@ func (w *writer) compLit(lit *syntax.CompositeLit) {
 				elem = kv.Value
 			}
 		}
-		w.pos(elem)
 		w.implicitConvExpr(elemType, elem)
 	}
 }