Continuing experiment: track the scopes of local variables via __builtin_debug

As observed by B. Schommer, it is not enough to track scopes for every source line, as blocks can occur on a single line (think macros).  Hence:

- Revert debug annotations of kind 1 to contain only line number info.
  Generate them only when the line number changes.
- Use debug annotations of kind 6 to record the list of active scopes
  (as BA_int integer arguments to __builtin_annot).  Generate them
  before every nontrivial statement, even if on the same line as others.
- Remove the generation of "variable x is declared in scope N" debug
  annotations.  This can be tracked separately and more efficiently.

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