1.0.31.9: some PCL micro-optimizations

1.0.31.9: some PCL micro-optimizations

 * Make *BOOT-STATE* a global variable and rename it **BOOT-STATE**.

 * Make various *S?-FOO-INDEX* variables constants, and rename them
   +S?-FOO-INDEX+.

 * Special love for SAFE-METHOD-FOO functions: store standard method
   class list in a global variable, use EQ for membership testing, and
   use STD-INSTANCE-SLOTS instead of GET-SLOTS (if the method has one
   of the standard classes, we know it is a standard instance.)

 Low-lying Nutrient Poor Fruit 'R Us.