Metal: Refactor textureProj[Offset] wrappers * Removed variadic macros. * Split bias variants into separate wrappers. * Updated emitter to not output unused variants. Bug: angleproject:368059227 Change-Id: I6e08e92dfbc2378bfc4ccd7760dbe28f6bc64f27 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5893163 Commit-Queue: Alexey Knyazev <lexa.knyazev@gmail.com> Reviewed-by: Geoff Lang <geofflang@chromium.org>