Always return to the InterpreterEntryTrampoline rather than calling the
InterpreterExitTrampoline from the Return bytecode handler. This fixes a
regression which occured if we upset the call/return stack by skipping the
return to the InterpreterEntryTrampoline from the return bytecode handler.

BUG=chromium:759390,chromium:753705

Change-Id: Ib625654a4a5072ac6c8d8e9611d1b9c0bbced4ca
Reviewed-on: https://chromium-review.googlesource.com/649517
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47826}