- Add d8.file.read() and d8.file.execute() helpers
- Change tools and tests to use new d8.file helper
- Unify error throwing in v8::Shell::ReadFile

Change-Id: I5ef4cb27f217508a367106f01e872a4059d5e399
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2928505
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Reviewed-by: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74883}

We are overwriting rhs when dst == rhs && dst != lhs. This is not a
problem on TurboFan because we specify unique registers and dst == lhs
in the instruction-selector.

The fix is to use the helper EmitSimdCommutativeBinOp, which will check
for dst == rhs (pmuludq is commutative).

Bug: v8:11612
Change-Id: I38c3a2b7f3c7bcf2d7e8faec1a67f0814d44ed20
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2798527
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73780}