[fixes #2327] mostly trivial: Added this. for field access and unified code gen of build() methods for @Builder.

test/transform/resource/after-delombok/BuilderGenericMethod.java

@@ -25,7 +25,7 @@ class BuilderGenericMethod<T> {
 		}
 		@java.lang.SuppressWarnings("all")
 		public Map<N, T> build() {
-			return BuilderGenericMethod.this.<N>foo(a, b);
+			return BuilderGenericMethod.this.<N>foo(this.a, this.b);
 		}
 		@java.lang.Override
 		@java.lang.SuppressWarnings("all")