target/alpha: Simplify gen_bcond_internal()

target/alpha: Simplify gen_bcond_internal()

Richard Henderson explained on IRC:

  bcond_internal() used to insist that both branch
  destination and branch fallthrough are use_goto_tb;
  if not, we'd use movcond to compute an indirect jump.
  But it's perfectly fine for e.g. the branch fallthrough
  to use_goto_tb, and the branch destination to use
  an indirect branch.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20240424234436.995410-4-richard.henderson@linaro.org>
[PMD: Split bigger patch, part 4/5]
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20240503072014.24751-7-philmd@linaro.org>