Added new option -Yshow-syms.

symbols. Specifically, it extracts all the symbols attached to AST
nodes, and then prints them hierarchically along with indicators for new
symbols and other interesting factoids like disappearing symbols.

A small demonstration. Output shown is obviously only a fraction of what
is produced.

// a.scala
class A { Nil foreach println }

% scalac -Yshow-syms -uniqid a.scala

[[symbol layout at end of selectivecps]]
  class A#17
      constructor A#8019
      value <local A>#8020
          value $anonfun#10961 <synthetic>
              value x#10971 <synthetic>

[[symbol layout at end of uncurry]]
  class A#17
      constructor A#8019
      value <local A>#8020
*         anonymous class $anonfun#10993 final <synthetic>
*             constructor $anonfun#11001
*             method apply#10994 final
                  value x#10971 <synthetic>
*             value <local $anonfun>#10999

No review.

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