CL/Vulkan: Add native builtins to clspv compiler Add a set of native builtins that are known to perform better for Samsung devices. A feature condition `uses_native_builtin_cl_kernel` is setup in `vk_featurs.json` for control of the selection. The following files are autogenerated - FeaturesVk_autogen.h - angle_features_autogen.cpp - angle_features_autogen.h Bug: angleproject:361717757 Change-Id: I10ffad0cbf1d4c2e9bfeea768311d90b0f65af2d Signed-off-by: Gowtham Tammana <g.tammana@samsung.com> Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6092036 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>