Enable -Wself-assign-memvar for Mesa, merge upstream fix for the one violation

third_party/mesa/MesaLib/src/glsl/ir.h

 /* -*- c++ -*- */
 /*
  * Copyright © 2010 Intel Corporation
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
  * to deal in the Software without restriction, including without limitation
  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  * and/or sell copies of the Software, and to permit persons to whom the
  * Software is furnished to do so, subject to the following conditions:
@@ skipping 971 matching lines @@
 public:
    enum jump_mode {
       jump_break,
       jump_continue
    };
 
    ir_loop_jump(jump_mode mode)
    {
       this->ir_type = ir_type_loop_jump;
       this->mode = mode;
-      this->loop = loop;
    }
 
    virtual ir_loop_jump *clone(void *mem_ctx, struct hash_table *) const;
 
    virtual void accept(ir_visitor *v)
    {
       v->visit(this);
    }
 
    virtual ir_visitor_status accept(ir_hierarchical_visitor *);
 
    bool is_break() const
    {
       return mode == jump_break;
    }
 
    bool is_continue() const
    {
       return mode == jump_continue;
    }
 
    /** Mode selector for the jump instruction. */
    enum jump_mode mode;
-private:
-   /** Loop containing this break instruction. */
-   ir_loop *loop;
 };
 
 /**
  * IR instruction representing discard statements.
  */
 class ir_discard : public ir_jump {
 public:
    ir_discard()
    {
       this->ir_type = ir_type_discard;
@@ skipping 473 matching lines @@
 import_prototypes(const exec_list *source, exec_list *dest,
                   struct glsl_symbol_table *symbols, void *mem_ctx);
 
 extern bool
 ir_has_call(ir_instruction *ir);
 
 extern void
 do_set_program_inouts(exec_list *instructions, struct gl_program *prog);
 
 #endif /* IR_H */