- Collect input attachment formats from the current subpass
- Include InputAttachmentIndex in descriptor decorations
- Make window-space integer coords available to fragment shader
- Rework EmitImageLoad to use VkFormat rather than spirv format
- Use window-space-coord-relative addressing for GetTexelPointer
  on spv::DimSubpassData images
- Use input attachment format rather than OpTypeImage baked-in
  format for spv::DimSubpassData images.

Bug: b/131171141
Test: dEQP-VK.renderpass*.input.*
Change-Id: I15412e66516ea907d4b2ffd913a9eb1a3f8a9bb9
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/29689Tested-by: Chris Forbes <chrisforbes@google.com>
Presubmit-Ready: Chris Forbes <chrisforbes@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>