Use common helper functions for getting sorted map keys.

Add a new helper SortedIntKeys similar to SortedStringKeys.

Test: lunch aosp_cf_x86_phone-userdebug && m
Change-Id: I08a43ec2cae7d1a82531295aca1a0658e3a0dd6f

dexpreopt/config.go

@@ -17,7 +17,6 @@ package dexpreopt
 import (
 	"encoding/json"
 	"fmt"
-	"sort"
 	"strings"
 
 	"github.com/google/blueprint"
@@ -142,16 +141,6 @@ func (libPaths LibraryPaths) AddLibraryPaths(otherPaths LibraryPaths) {
 	}
 }
 
-// Return sorted names of the libraries in the map.
-func (libPaths LibraryPaths) Names() []string {
-	keys := make([]string, 0, len(libPaths))
-	for k := range libPaths {
-		keys = append(keys, k)
-	}
-	sort.Strings(keys)
-	return keys
-}
-
 type ModuleConfig struct {
 	Name            string
 	DexLocation     string // dex location on device