Current GetIterator bytecode loads and calls @@iterator property on a
given object. This change extends the bytecode functionality to check
whether the value returned after calling @@iterator property is a valid
JSReceiver. The bytecode throws SymbolIteratorInvalid exception if the
returned value is not a valid JSReceiver. This change absorbs the
functionality of additional two bytecodes - JumpIfJSReceiver and
CallRuntime, that are part of the iterator protocol in the GetIterator
bytecode.

Bug: v8:9489
Change-Id: I9e84cfe85eeb9a1b8a97ca0595375ac26ba1bbfd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1792905Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Swapnil Gaikwad <swapnilgaikwad@google.com>
Cr-Commit-Position: refs/heads/master@{#63704}