Allow changing of lambda SAM types (alter method descriptor)

This is currently the 'slow' implementation and actually
slows down invokeinterface too - need to get the fast version
done...

testdata-java8/src/main/java/basic/LambdaI.java

@@ -0,0 +1,17 @@
+package basic;
+
+public class LambdaI {
+	
+	public interface Foo { String m(String in); }
+
+	
+	public static void main(String[] args) {
+		run();
+	}
+	
+	public static String run() {
+		Foo f = (s) ->  s;
+		return f.m("a");
+	}
+	
+}

testdata-java8/src/main/java/basic/LambdaI2.java

@@ -0,0 +1,17 @@
+package basic;
+
+public class LambdaI2 {
+	
+	public interface Foo { String m(String in, String in2); }
+
+	
+	public static void main(String[] args) {
+		run();
+	}
+	
+	public static String run() {
+		Foo f = (s,t) -> s+t;
+		return f.m("a", "b");
+	}
+
+}