port 4b8051a0 (r28769)

original commit message:

    This splits the SuperReference AST node into SuperPropertyReference and
    SuperCallReference. The super call reference node consists of three
    unresolved vars to this, new.target and this_function. These gets
    declared when the right function is entered and if it is in use. The
    variables gets assigned in FullCodeGenerator::Generate.

    This is a revert of the revert 88b1c917

BUG=

Review URL: https://codereview.chromium.org/1163983002

Cr-Commit-Position: refs/heads/master@{#28900}