Implement type inference of method invocations in Fasta.

pkg/front_end/testcases/inference/infer_generic_method_type_positional2.dart.strong.expect

Index: pkg/front_end/testcases/inference/infer_generic_method_type_positional2.dart.strong.expect
diff --git a/pkg/front_end/testcases/inference/infer_generic_method_type_positional2.dart.strong.expect b/pkg/front_end/testcases/inference/infer_generic_method_type_positional2.dart.strong.expect
new file mode 100644
index 0000000000000000000000000000000000000000..89fce11595e3db5e07f1542de8a8d34054039f9a
--- /dev/null
+++ b/pkg/front_end/testcases/inference/infer_generic_method_type_positional2.dart.strong.expect
@@ -0,0 +1,14 @@
+library test;
+import self as self;
+import "dart:core" as core;
+
+class C extends core::Object {
+  constructor •() → void
+    : super core::Object::•()
+    ;
+  method m(core::int a, [core::String b = null, dynamic c = null]) → dynamic
+    return null;
+}
+static method main() → dynamic {
+  core::double y = new self::C::•().m(1, "bbb", 2.0);
+}