Inferred names are currently generated for FunctionLiterals but not generated
for ClassLiterals. Without them, DevTools does not have enough information to
make descriptive descriptions.

E.g.
var x = {y: class{}};
var a = new x.y();
console.log(a);

This shows "Object{}" when it could be more descriptive "x.y {}"

BUG=v8:5621
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel

Review-Url: https://codereview.chromium.org/2488193003
Cr-Commit-Position: refs/heads/master@{#41013}