[PATCH, alpha]: Some cleanups

[Uros Bizjak]

No functional changes.

2015-05-18  Uros Bizjak  <ubizjak@gmail.com>

    * config/alpha/alpha.c (alpha_legitimize_reload_address)
    (alpha_preferred_reload_class, alpha_legitimate_constant_p): Use
    CONST_INT_P, CONST_SCALAR_INT_P and CONST_DOUBLE_P predicates.
    (alpha_split_reload_pair) <case CONST_INT, case CONST_WIDE_INT>:
    Use CASE_CONST_SCALAR_INT.
    (print_operand) <case 'M'>: Use mode_width_operand to check the
    value of the constant.
    * config/alpha/alpha.md (movti): Use CONST_SCALAR_INT_P predicate.
    * config/alpha/predicates.md (input_operand): Use general_operand
    instead of match_code as operand check.
    (symbolic_operand): Use match_code with subexpression digits.
    * config/alpha/constraints.md (Q): Ditto.

Tested on alpha-linux-gnu and committed to mainline SVN.

Uros.