Revert "i965: use nir_lower_indirect_derefs() for GLSL"

This reverts commit 9404439a75.  I didn't
intend to push it and it breaks clip and cull distance.

src/intel/vulkan/anv_pipeline.c

@@ -177,6 +177,16 @@ anv_shader_compile_to_nir(struct anv_device *device,
 
    nir_shader_gather_info(nir, entry_point->impl);
 
+   nir_variable_mode indirect_mask = 0;
+   if (compiler->glsl_compiler_options[stage].EmitNoIndirectInput)
+      indirect_mask |= nir_var_shader_in;
+   if (compiler->glsl_compiler_options[stage].EmitNoIndirectOutput)
+      indirect_mask |= nir_var_shader_out;
+   if (compiler->glsl_compiler_options[stage].EmitNoIndirectTemp)
+      indirect_mask |= nir_var_local;
+
+   nir_lower_indirect_derefs(nir, indirect_mask);
+
    return nir;
 }
 

src/mesa/drivers/dri/i965/brw_link.cpp

@@ -137,6 +137,19 @@ process_glsl_ir(struct brw_context *brw,
 
    do_copy_propagation(shader->ir);
 
+   bool lowered_variable_indexing =
+      lower_variable_index_to_cond_assign(shader->Stage, shader->ir,
+                                          options->EmitNoIndirectInput,
+                                          options->EmitNoIndirectOutput,
+                                          options->EmitNoIndirectTemp,
+                                          options->EmitNoIndirectUniform);
+
+   if (unlikely(brw->perf_debug && lowered_variable_indexing)) {
+      perf_debug("Unsupported form of variable indexing in %s; falling "
+                 "back to very inefficient code generation\n",
+                 _mesa_shader_stage_to_abbrev(shader->Stage));
+   }
+
    bool progress;
    do {
       progress = false;

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

@@ -485,16 +485,6 @@ brw_preprocess_nir(const struct brw_compiler *compiler, nir_shader *nir)
    /* Lower a bunch of stuff */
    OPT_V(nir_lower_var_copies);
 
-   nir_variable_mode indirect_mask = 0;
-   if (compiler->glsl_compiler_options[nir->stage].EmitNoIndirectInput)
-      indirect_mask |= nir_var_shader_in;
-   if (compiler->glsl_compiler_options[nir->stage].EmitNoIndirectOutput)
-      indirect_mask |= nir_var_shader_out;
-   if (compiler->glsl_compiler_options[nir->stage].EmitNoIndirectTemp)
-      indirect_mask |= nir_var_local;
-
-   nir_lower_indirect_derefs(nir, indirect_mask);
-
    /* Get rid of split copies */
    nir = nir_optimize(nir, is_scalar);