iris, i965: Drop max_variable_local_size

This was used to decide which SIMD width to generate code for
ARB_compute_variable_group_size.  Now that compiler will generate
multiple SIMD widths, this information is unused.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5142>

src/compiler/shader_info.h

@@ -302,7 +302,6 @@ typedef struct shader_info {
 
       struct {
          uint16_t local_size[3];
-         uint16_t max_variable_local_size;
 
          bool local_size_variable:1;
          uint8_t user_data_components_amd:3;

src/gallium/drivers/iris/iris_program.c

@@ -1963,11 +1963,6 @@ iris_compile_cs(struct iris_context *ice,
 
    nir_shader *nir = nir_shader_clone(mem_ctx, ish->nir);
 
-   if (nir->info.cs.local_size_variable) {
-      nir->info.cs.max_variable_local_size =
-         iris_get_max_var_invocations(screen);
-   }
-
    NIR_PASS_V(nir, brw_nir_lower_cs_intrinsics);
 
    iris_setup_uniforms(compiler, mem_ctx, nir, prog_data, &system_values,

src/mesa/drivers/dri/i965/brw_cs.c

@@ -88,7 +88,6 @@ brw_codegen_cs_prog(struct brw_context *brw,
    struct brw_cs_prog_data prog_data;
    bool start_busy = false;
    double start_time = 0;
-   struct gl_context *gl_ctx = &brw->ctx;
    nir_shader *nir = nir_shader_clone(mem_ctx, cp->program.nir);
 
    memset(&prog_data, 0, sizeof(prog_data));
@@ -119,14 +118,6 @@ brw_codegen_cs_prog(struct brw_context *brw,
    if (INTEL_DEBUG & DEBUG_SHADER_TIME)
       st_index = brw_get_shader_time_index(brw, &cp->program, ST_CS, true);
 
-   /* If the work group size is variable we set it to the maximum here since
-    * the actual size is not known until the dispatch command is issued.
-    */
-   if (nir->info.cs.local_size_variable) {
-      nir->info.cs.max_variable_local_size =
-         gl_ctx->Const.MaxComputeVariableGroupInvocations;
-   }
-
    brw_nir_lower_cs_intrinsics(nir);
 
    char *error_str;