cmd/compile: use types2.Sizes instead of compiler own implementation

With #61035 fixed, types2.Sizes matches the compiler behavior, so use its
Sizes implementation instead of rolling our own copy.

Updates #61035

Change-Id: I7b9efd27a01f729a04c79cd6b4ee5f417fe6e664
Reviewed-on: https://go-review.googlesource.com/c/go/+/506716
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>

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

@@ -6,6 +6,7 @@ package noder
 
 import (
 	"fmt"
+	"internal/buildcfg"
 	"internal/types/errors"
 	"regexp"
 	"sort"
@@ -51,7 +52,7 @@ func checkFiles(m posMap, noders []*noder) (*types2.Package, *types2.Info) {
 			base.ErrorfAt(m.makeXPos(terr.Pos), terr.Code, "%s", msg)
 		},
 		Importer: &importer,
-		Sizes:    &gcSizes{},
+		Sizes:    types2.SizesFor("gc", buildcfg.GOARCH),
 	}
 	if base.Flag.ErrorURL {
 		conf.ErrorURL = " [go.dev/e/%s]"