[Bug 108957] VkRunner tests assert when run with nir test environment variables

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108957

            Bug ID: 108957
           Summary: VkRunner tests assert when run with nir test
                    environment variables
           Product: Mesa
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: mark.a.janes at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Mesa i965 CI runs tests in a mode designed to detect problems with our use of
NIR.  The following environment variables are set:

NIR_TEST_CLONE=true NIR_TEST_SERIALIZE=true

With the addition of VkRunner tests to piglit, the following tests began to
fail in this mode:

piglit.vulkan.glsl450.face-forward-double
piglit.vulkan.glsl450.frexp-double
piglit.vulkan.glsl450.isinf-double
piglit.vulkan.glsl450.reflect-double
piglit.vulkan.glsl450.refract-double
piglit.vulkan.shaders.fs-large-local-array
piglit.vulkan.shaders.fs-large-local-array-vec2
piglit.vulkan.shaders.fs-large-local-array-vec3
piglit.vulkan.shaders.fs-large-local-array-vec4
piglit.vulkan.shaders.fs-multiple-large-local-array

stderr:
/tmp/vkrunner-1E4K6k
vkrunner: ../src/intel/vulkan/anv_pipeline.c:193: anv_shader_compile_to_nir:
Assertion `exec_list_length(&nir->functions) == 1' failed.

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