This reverts commit 027bc47c.

Reason for revert: InstancingTests fail on Mac FYI Release (Intel UHD 630), see https://ci.chromium.org/ui/p/chromium/builders/ci/Mac%20FYI%20Release%20(Intel%20UHD%20630)/1729/overview

Original change's description:
> Workaround for Mac Intel drawArraysInstanced with first > 0
>
> Workaround by forcefully set instanced arrays (divisor > 0)
> as streaming attributes and apply extra offset at front. Recover
> those attribute bindings when first == 0 and other draw calls
> (drawElementsInstanced)
>
> Bug: chromium:1144207, chromium:1144247, chromium:1144373
> Change-Id: Ie7836cc71b45a290513f34f90d49bd15b14ddba8
> Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2661095
> Commit-Queue: Shrek Shao <shrekshao@google.com>
> Reviewed-by: Geoff Lang <geofflang@chromium.org>

Bug: chromium:1144207
Bug: chromium:1144247
Bug: chromium:1144373
Change-Id: Ia4a6026a8c446490346b373c33fe2b1724c1761f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2704052
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>