[PATCH v2 0/4] MR616: tests: Improvements for SM1 testing.

[Francisco Casas (＠fcasas)]

This is the first part of !608, which I decided to separate to ease review.

It consists of improvements to SM1 testing, mainly:
- Correctly passing int and bool uniforms as IEEE 754 floats to SM1 profiles.
- The introduction of the "only" qualifier to avoid abusing `[require]` blocks in case tests retrieve different results for different shader models.
- Allowing some of the tests we already have for SM4/SM6 to run in SM1 after those improvements.

--
  v2: tests: Remove [require] directives for tests that use int and bool uniforms.
      tests/shader-runner: Introduce "if" qualifier.
      tests: Don't ignore SM1 on a non-const-indexing.shader_test test.
      tests/vkd3d-shader: Set uninitialized uniforms to zero.

https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/616