For abi diffing, factor in arch variant and primary arch.
am: ac066c6b90

Change-Id: Ifb7df61cee156e4578bf8af90b7d9263335c4448
diff --git a/android/paths.go b/android/paths.go
index ffdb393..cf5544d 100644
--- a/android/paths.go
+++ b/android/paths.go
@@ -776,7 +776,12 @@
 // PathForVndkRefDump returns an OptionalPath representing the path of the reference
 // abi dump for the given module. This is not guaranteed to be valid.
 func PathForVndkRefAbiDump(ctx ModuleContext, version, fileName string, vndkOrNdk, isSourceDump bool) OptionalPath {
-	archName := ctx.Arch().ArchType.Name
+	arches := ctx.DeviceConfig().Arches()
+	currentArch := ctx.Arch()
+	archNameAndVariant := currentArch.ArchType.String()
+	if currentArch.ArchVariant != "" {
+		archNameAndVariant += "_" + currentArch.ArchVariant
+	}
 	var sourceOrBinaryDir string
 	var vndkOrNdkDir string
 	var ext string
@@ -792,8 +797,12 @@
 	} else {
 		vndkOrNdkDir = "ndk"
 	}
-	refDumpFileStr := "prebuilts/abi-dumps/" + vndkOrNdkDir + "/" + version + "/" +
-		archName + "/" + sourceOrBinaryDir + "/" + fileName + ext
+	if len(arches) == 0 {
+		panic("device build with no primary arch")
+	}
+	primary_arch := arches[0].ArchType.String()
+	refDumpFileStr := "prebuilts/abi-dumps/" + vndkOrNdkDir + "/" + version + "/" + primary_arch + "/" +
+		archNameAndVariant + "/" + sourceOrBinaryDir + "/" + fileName + ext
 	return ExistentPathForSource(ctx, refDumpFileStr)
 }