cmd/compile: remove forceObjFileStability

The textual import/export format is ancient history.

Change-Id: Iebe90bfd9bd3074eb191186d86e5f4286ce3b1f3
Reviewed-on: https://go-review.googlesource.com/39850
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/cmd/compile/internal/gc/bexport.go

@@ -133,12 +133,6 @@ import (
 // (suspected) format errors, and whenever a change is made to the format.
 const debugFormat = false // default: false
 
-// forceObjFileStability enforces additional constraints in export data
-// and other parts of the compiler to eliminate object file differences
-// only due to the choice of export format.
-// TODO(gri) disable and remove once there is only one export format again
-const forceObjFileStability = true
-
 // Current export format version. Increase with each format change.
 // 4: type name objects support type aliases, uses aliasTag
 // 3: Go1.8 encoding (same as version 2, aliasTag defined but never used)
@@ -979,7 +973,7 @@ func parName(f *Field, numbered bool) string {
 	// Functions that can be inlined use numbered parameters so we can distinguish them
 	// from other names in their context after inlining (i.e., the parameter numbering
 	// is a form of parameter rewriting). See issue 4326 for an example and test case.
-	if forceObjFileStability || numbered {
+	if numbered {
 		if !strings.Contains(name, "·") && f.Nname != nil && f.Nname.Name != nil && f.Nname.Name.Vargen > 0 {
 			name = fmt.Sprintf("%s·%d", name, f.Nname.Name.Vargen) // append Vargen
 		}

src/cmd/compile/internal/gc/reflect.go

@@ -1501,11 +1501,6 @@ func dumptypestructs() {
 	}
 
 	// generate import strings for imported packages
-	if forceObjFileStability {
-		// Sorting the packages is not necessary but to compare binaries created
-		// using textual and binary format we sort by path to reduce differences.
-		sort.Sort(pkgByPath(pkgs))
-	}
 	for _, p := range pkgs {
 		if p.Direct {
 			dimportpath(p)