Fix tailstrict implementation and add more tests

[stephenamar-db]

Fixes #359

[stephenamar-db]

@He-Pin @Danstahrm

[He-Pin]

1. there is a long_chains.jsonnet in google/jsonnet repo
2. there are more tests about tailstrict in google/go-jsonnet repo, eg tailstrict_operator2.jsonnet

We can includes both here too.

[stephenamar-db]

I can get long_chains to pass, but let's add it to a future bench suite.

~/sjsonnet % JAVA_OPTS="-Xss500m" out/sjsonnet/jvm/3.3.6/assembly.dest/out.jar long_chains.jsonnet                                                                  
true