new inference: process varargs as separate method candidate/separate phase

(cherry picked from commit fdd6f66268d29bb996a103f69180851b92947d21)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/diamond/Varargs.java

@@ -0,0 +1,26 @@
+class A<T> {
+  A(T... t) {
+  }
+
+  {
+    A<String> a = new A<>("a", "b");
+    foo(new A<>("", ""));
+    bar(new A<>("", ""));
+    bar(new A<>(get()));
+    //bar(new A<>(get( ), ""));
+  }
+
+  void foo(A<String> s) {}
+  <T> void bar(A<T> s) {}
+
+  <K> K get() {return null;}
+
+  <M> A<M> s(M... m) {
+    return null;
+  }
+
+  {
+    bar(s(get()));
+    bar(s(get(), ""));
+  }
+}