Revert "Vulkan: SwiftShader integration." This reverts commit 1224802c214d8f3d5b1f31a35d4461ada39b94c1. Reason for revert: https://bugs.chromium.org/p/angleproject/issues/detail?id=3912 Original change's description: > Vulkan: SwiftShader integration. > > Adds a new EGL extension for picking SwiftShader when using the Vulkan > back-end. Also cleans up ICD enabling code RendererVk. Also includes a > change to a buffer size necessary to support SwiftShader's minimum > limits. > > 32-bit is currently left disabled to work around an issue on AMD Win7. > > Bug: angleproject:3876 > Bug: b/140251624 > Change-Id: I33c55d994801d6154caca0cad0a608c1e808d517 > Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1776231 > Commit-Queue: Jamie Madill <jmadill@chromium.org> > Reviewed-by: Geoff Lang <geofflang@chromium.org> TBR=geofflang@chromium.org,jonahr@google.com,jmadill@chromium.org Change-Id: Id7464250f6941b0228a6b2a9bd0349823727275b No-Presubmit: true No-Tree-Checks: true No-Try: true Bug: angleproject:3876, b/140251624 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1808101 Reviewed-by: Zhenyao Mo <zmo@chromium.org> Commit-Queue: Zhenyao Mo <zmo@chromium.org>