anv: fixup invalid enum for nir environment

Also switching away from PIPE_

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Fixes: 8c4c4c3ee1 ("anv: Add softtp64 workaround")
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19638>

src/intel/vulkan/anv_pipeline_cache.c

@@ -446,13 +446,13 @@ anv_load_fp64_shader(struct anv_device *device)
          .int16 = true,
          .int64 = true,
       },
-      .environment = MESA_SHADER_VERTEX,
+      .environment = NIR_SPIRV_VULKAN,
       .create_library = true
    };
 
    nir_shader* nir =
       spirv_to_nir(float64_spv_source, sizeof(float64_spv_source) / 4,
-                   NULL, 0, PIPE_SHADER_VERTEX, "main",
+                   NULL, 0, MESA_SHADER_VERTEX, "main",
                    &spirv_options, nir_options);
 
    assert(nir != NULL);