Port 4558c1df

Original Commit Message:

    As a drive-by, the order of rounding_average_u is adjusted according to src/wasm/wasm-opcodes.h.

R=zhiguo.zhou@intel.com, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Change-Id: Ib5c72c9187ee3803c5c04b4fb62422be67382bf1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2148649Reviewed-by: Junliang Yan <jyan@ca.ibm.com>
Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#67113}