Port 871183ea

Original Commit Message:

     - Add wasm opcode, decode and compiler code for v128.const
     - Add codegen implementations for v128.const on x64/Arm64
     - Reuse/Rename some shuffle specific methods to handle generic
     128-bit immediates
     - Tests

R=gdeepti@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Change-Id: Ia4990f768b6fac0ac72cf79129a53b531c9c2fa9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2280541Reviewed-by: Junliang Yan <jyan@ca.ibm.com>
Reviewed-by: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Bill Budge <bbudge@chromium.org>
Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#68691}