1.0.6.48: Don't instrument the internal flets from the PROGV expansion

1.0.6.48: Don't instrument the internal flets from the PROGV expansion

        * PROGV would get compiled to BINDING-STACK-POINTER -> X, ...,
          BIND-SENTINEL, UNBIND-TO-HERE X, UNBIND-SENTINEL. So the
          UNBIND-TO-HERE would also pop the sentinel from the binding stack,
          and the UNBIND-SENTINEL would then unbalance the stack.
        * Ensure that there will only be matched BIND-SENTINEL /
          UNBIND-SENTINEL pairs between taking the binding stack pointer
          and unwinding by adding some (OPTIMIZE (INSERT-DEBUG-CATCH 0))
          declarations.
	* Reported by Nikodemus