Stop inserting fake frames on VM stack.

Now similar "fake" frames now materialized when fetching debug
backtraces. The patch also fixes few incorrect backtraces for generators
in *.p

Stop inserting fake frames on VM stack.

Now similar "fake" frames now materialized when fetching debug
backtraces. The patch also fixes few incorrect backtraces for generators
in *.phpt tests.

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Rethrow generator exception even without active stack frame

Finally blocks in generators may be invoked during shutdown, in
which case we don't have a stack frame. Similar to what
ze

Rethrow generator exception even without active stack frame

Finally blocks in generators may be invoked during shutdown, in
which case we don't have a stack frame. Similar to what
zend_call_function does, we still need to rethrow these exceptions,
otherwise they will be hidden (and leak).

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