Add Bias and Fetch to divergent Lod sampling
Add Bias and Fetch to divergent Lod sampling

It's possible for Bias and Fetch to have divergent LODs, so they should
use the same route as Grad and Lod sampling methods.

Bug: b/133868964
Bug: b/163791974
Tests: dEQP-VK.texture.subgroup_lod.texelfetch

Change-Id: Ie792e17589ce2b22861184eb3ffca25503b2e428
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/55990
Tested-by: Sean Risser <2d04e98eeaa433fb55534399ab3ab2c06fdf7967@google.com>
Commit-Queue: Sean Risser <2d04e98eeaa433fb55534399ab3ab2c06fdf7967@google.com>
Reviewed-by: Nicolas Capens <51edc787c30f24c4904e8ffbb5523c3a9f7a451d@google.com>

google/swiftshader,google/swiftshader,google/swiftshader