make dependency order stable

lib/Compilation.js

@@ -645,7 +645,15 @@ class Compilation extends Tapable {
 					war.dependencies = dependencies;
 					this.warnings.push(war);
 				}
-				module.dependencies.sort((a, b) => compareLocations(a.loc, b.loc));
+				const originalMap = module.dependencies.reduce((map, v, i) => {
+					map.set(v, i);
+					return map;
+				}, new Map());
+				module.dependencies.sort((a, b) => {
+					const cmp = compareLocations(a.loc, b.loc);
+					if (cmp) return cmp;
+					return originalMap.get(a) - originalMap.get(b);
+				});
 				if (error) {
 					this.hooks.failedModule.call(module, error);
 					return callback(error);
@@ -2127,6 +2135,8 @@ class Compilation extends Tapable {
 		for (let indexChunk = 0; indexChunk < chunks.length; indexChunk++) {
 			chunks[indexChunk].sortItems();
 		}
+
+		chunks.sort((a, b) => a.compareTo(b));
 	}
 
 	sortItemsWithChunkIds() {