switch question in recog.c

[Nix]

On Tue, 7 Oct 2003, Zack Weinberg moaned:
> "For maximum obfuscation, the outer braces can be removed":

The most extreme example of this I've ever seen came from the
UNIX-HATERS archives, attributed to Harbison and Steele's "C: A
Reference Manual".. I'm sure that everyone looking at this will
agree that it is a nice clear and sensible micro-optimization:

  switch (x)
    default:
      if (prime(x))
        case 2: case 3: case 5: case 7:
	  process_prime(x);
      else
        case 4: case 6: case 8: case 9: case 10:
	  process_composite(x);

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