The constructor and new.target arguments were passed to CallConstruct in
the wrong order by BytecodeGraphBuilder, which caused subclassing to be
incorrect when optimizing from bytecode.

Also clean up some unecessary functions in interpreter.cc found while
figuring this out.

BUG=chromium:642409

Review-Url: https://codereview.chromium.org/2312103002
Cr-Commit-Position: refs/heads/master@{#39204}