[vta, trunk?] avoid uninitialized variable warnings building with -O3

[Bradley Lucier]

Re:

> Initialization for binary_loc shouldn't be necessary, this appears to
> be a defficiency of the optimizer, that doesn't realize that the POPs
> at the end will never be executed unless we ever PUSH something, at
> which point binary_loc will have been initialized.  Can't quite blame
> the optimizer for not figuring that out :-)


The same issue in a different context was reported as PR37369 on the  
trunk.

Brad