anv: Enable VK_KHR_shader_maximal_reconvergence

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27278>

src/compiler/spirv/vtn_private.h

@@ -680,8 +680,10 @@ struct vtn_builder {
    /* True if we need to ignore OpReturn after OpEmitMeshTasksEXT. */
    bool wa_ignore_return_after_emit_mesh_tasks;
 
-   /* Workaround discard bugs in HLSL -> SPIR-V compilers */
+   /* True if DemoteToHelperInvocation capability is used by the shader. */
    bool uses_demote_to_helper_invocation;
+
+   /* Workaround discard bugs in HLSL -> SPIR-V compilers */
    bool convert_discard_to_demote;
 
    gl_shader_stage entry_point_stage;

src/intel/vulkan/anv_device.c

@@ -302,6 +302,7 @@ get_device_extensions(const struct anv_physical_device *device,
       .KHR_shader_float16_int8               = !device->instance->no_16bit,
       .KHR_shader_float_controls             = true,
       .KHR_shader_integer_dot_product        = true,
+      .KHR_shader_maximal_reconvergence      = true,
       .KHR_shader_non_semantic_info          = true,
       .KHR_shader_subgroup_extended_types    = true,
       .KHR_shader_subgroup_rotate            = true,
@@ -882,6 +883,8 @@ get_features(const struct anv_physical_device *pdevice,
       /* VK_KHR_cooperative_matrix */
       .cooperativeMatrix = anv_has_cooperative_matrix(pdevice),
 
+      /* VK_KHR_shader_maximal_reconvergence */
+      .shaderMaximalReconvergence = true,
 
       /* VK_KHR_shader_subgroup_rotate */
       .shaderSubgroupRotate = true,