Also fix Lod + Offset combination, and rename the parameter that holds
either lod or bias to lodOrBias.

Bug: b/129523279
Test: dEQP-VK.glsl.texture_functions.*
Change-Id: I397959421651e990d041f4297c4bcf55e1c00f03
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/30229Reviewed-by: Chris Forbes <chrisforbes@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>