- Add new instruction variants for psllq, psrlq (x64), vshl (ARM)
 - Add instruction selection, code generation for register shifts
 - Remove implicit immediate for shift operators
 - Fix interpreter, tests

Bug:v8:8934, v8:8460

Change-Id: I3481d7ba34a34f7792ff1a61d4a726a1a9abab8d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1722198
Commit-Queue: Deepti Gandluri <gdeepti@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Bill Budge <bbudge@chromium.org>
Reviewed-by: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62995}