Modernize ix86_expand_sse_movcc to use expand_simple_{unop,binop}
infrastructure to avoid manual twiddling with output registers.
Also fix a couple of inconsistent vector_all_ones_operand usages,
break a couple of unnecessary else-if chains, eliminate common
subexpressions and do some general code simplifications.

2022-01-15  Uroš Bizjak  <ubizjak@gmail.com>

gcc/ChangeLog:

    * config/i386/i386-expand.c (ix86_expand_sse_movcc): Use
    expand_simple_unop and expand_simple_binop instead of manually
    constructing NOT, AND and IOR RTXes.  Use vector_all_ones_operand
    consistently.  Eliminate common subexpressions and simplify code.
    * config/i386/sse.md (<any_logic:code><MODEF:mode>3): New expander.
    (<any_logic:code><MODEF:mode>3): Make public.

Bootstrapped and regression tested on x86_64-linux-gnu {,-m32}.

Pushed to master.

Uros.