[PATCH] Fix PR libstdc++/19510 on 3.3 branch

[Gabriel Dos Reis]

Volker Reichelt <reichelt@igpm.rwth-aachen.de> writes:

| On 20 Jan, Gabriel Dos Reis wrote:
| > Volker Reichelt <reichelt@igpm.rwth-aachen.de> writes:
| >
| > | OK if I prepare a patch for 3.3, too?
| > 
| > After you've applied to 3.4.x; yes.
| 
| Now that I committed the patches for mainline and the 3.4 branch,
| here's the patch for the 3.3 branch.
| 
| A quick reminder: PR libstdc++/19510 is about iterators that contain
| pointers which sometimes aren't initialized. Since copying ill-formed
| pointers might trigger hardware traps on some systems, this is a problem.
| The patch fixes that by providing missing default initializations.
| 
| Bootstrapped and regtested.

Yes.  Thanks for your work and time.

-- Gaby