- Removed twoSidedStencil, which was always true
  when stencil is enabled
- Removed unused enums and functions
- Removed custom new/delete operators
- Used VkFrontFace type for frontFace

Bug b/132280877

Change-Id: I440d5e910e50de0ac8049d3a56848fa8d2de3493
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/33531
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>