[PATCH, alpha]: Use alpha-passes.def to register passes.

[Uros Bizjak <ubizjak at gmail dot com>]

2016-10-11  Uros Bizjak  <ubizjak@gmail.com>

    * config/alpha/alpha-passes.def: New file.
    * config/alpha/t-alpha: New file.
    * config/alpha/alpha-protos.h (gcc::context, rtl_opt_pass): Declare.
    (make_pass_handle_trap_shadows): New prototype.
    (make_pass_align_insns): Ditto.
    * config/alpha/alpha.c (alpha_option_override): Don't register
    passes here.
    * config.gcc (alpha*-*-*) Add alpha/t-alpha to tmake_file.

Bootstrapped and regression tested on alphaev68-linux-gnu.

Committed to mainline SVN.

BTW - Jakub, it looks there is a bug in awk script. If the order of
pass insertion commands in alpha/alpha-passes.def is reversed to:

  INSERT_PASS_AFTER (pass_convert_to_eh_region_ranges, 1,
pass_handle_trap_shadows);
  INSERT_PASS_BEFORE (pass_shorten_branches, 1, pass_align_insns);

then the second pass is not registered for some reason. This can be
seen in generated pass-instances.def (also when building crosscompiler
to alpha-linux-gnu), where pass_align_insns insertion is simply
missing from what is the correct pass order:

          NEXT_PASS (pass_convert_to_eh_region_ranges, 1);
  NEXT_PASS ( pass_handle_trap_shadows, 1);
  NEXT_PASS ( pass_align_insns, 1);
          NEXT_PASS (pass_shorten_branches, 1);

(There is no problem with the pass insertion commands order, as
committed in the patch).

BTW2: There is a superfluous space generated after the opening paren.

Uros.

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