Two Fixes included to make V8 build work for Windows ARM64.
1. Don't emit ".def" and related macros to define function beginning, because they are invalid for Windows ARM64.
2. Set alignment of data section to 8 which is required for instruction which loads element from v8_Default_embedded_blob_.


Version 7.2.479

Performance and stability improvements on all platforms.

TBR=v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com

Change-Id: I0bfea5dd8ed6c1340d11c13dcc2e492e7b22aa8c
Reviewed-on: https://chromium-review.googlesource.com/c/1352210Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Original-Commit-Position: refs/heads/7.2.479@{#1}
Cr-Original-Branched-From: a8152aac-refs/heads/master@{#57863}
Bug: chromium:893460
Reviewed-on: https://chromium-review.googlesource.com/c/1352791Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Tom Tan <Tom.Tan@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#57915}