Merge branch 'bjorn/erts/clang-opt'

* bjorn/erts/clang-opt: (27 commits)
  Improve unpacking performance on x86_64
  Slightly tweak the peformance for get_list
  Speed up list matching
  Eliminate the variable temp_bits at the top scope of process_main()
  Eliminate prefetch for conditional instructions
  Teach beam_makeops to pack operands for move3 and move_window
  Ensure that the move_call_ext_{last,only} instructions are used
  beam_makeops: Eliminate unnecessary masking when packing 3 operands
  Use a cheaper tag scheme for 'd' operands
  Introduce swap_temp/3 and swap/2
  Introduce specialized versions of move2
  Add back frequently used x(0) instructions
  Rewrite the hipe_mode_switch instructions
  Remove the last use of tmp_arg1
  Eliminate use of tmp_arg1 and tmp_arg2 in bit syntax
  Remove the i_fetch instruction
  Eliminate use of i_fetch for bit syntax instructions
  Eliminate the use of i_fetch for BIF instructions
  Eliminate the use of i_fetch for relational operators
  Eliminate the use of i_fetch in arithmetic instructions
  ...

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