cmd/go: use the global rooted path name

Change-Id: I4a450af5f35f0ad4e4652789f1eda4d3171610e7
Reviewed-on: https://go-review.googlesource.com/c/go/+/302852
Run-TryBot: Jay Conrod <[email protected]>
TryBot-Result: Go Bot <[email protected]>
Reviewed-by: Jay Conrod <[email protected]>
Reviewed-by: Bryan C. Mills <[email protected]>
Trust: Jay Conrod <[email protected]>

Author: panjf2000

src/cmd/go/internal/base/path.go

@@ -32,10 +32,8 @@ func ShortPath(path string) string {
 // made relative to the current directory if they would be shorter.
 func RelPaths(paths []string) []string {
 	var out []string
-	// TODO(rsc): Can this use Cwd from above?
-	pwd, _ := os.Getwd()
 	for _, p := range paths {
-		rel, err := filepath.Rel(pwd, p)
+		rel, err := filepath.Rel(Cwd, p)
 		if err == nil && len(rel) < len(p) {
 			p = rel
 		}