Use “$init” for constructors in Java.registerClass()

For consistency with the class wrappers.

Author: oleavr

lib/class-factory.js

@@ -1841,10 +1841,11 @@ function ClassFactory (vm) {
       const methodNames = Object.keys(methods);
       const methodEntries = methodNames.reduce((result, name) => {
         const entry = methods[name];
+        const rawName = (name === '$init') ? '<init>' : name;
         if (entry instanceof Array) {
-          result.push(...entry.map(e => [name, e]));
+          result.push(...entry.map(e => [rawName, e]));
         } else {
-          result.push([name, entry]);
+          result.push([rawName, entry]);
         }
         return result;
       }, []);

test/re/frida/ClassCreationTest.java

@@ -362,7 +362,7 @@ public void classWithUserConstructorsCanBeImplemented() throws ClassNotFoundExce
                 "    buf: 'java.lang.StringBuilder'," +
                 "  }," +
                 "  methods: {" +
-                "    '<init>': [{" +
+                "    $init: [{" +
                 "      returnType: 'void'," +
                 "      argumentTypes: []," +
                 "      implementation: function () {" +