[vsipl++] [patch] Use new dispatch for matvec functions

[Don McCoy]

I'm reposting this patch now that the C-VSIPL backend has been fixed (as 
a result of Jules' discovery of the dropped 'const' used with 
Ext_data).  This patch corrects that problem and has been tested against 
a normal build as well as the full 'ref-impl' set of tests (for the case 
of being built as the reference implementation using the C-VSIPL backend).

This patch completely replaces the previous one.  Note also that the 
special evaluator used by the C-VSIPL backend to handle dot(a, conj(b)) 
and cvjdot(a, b) is no longer needed with the way the Ext_data 
constructor is now being called.  As a side note, expressions like 
dot(conj(a), b) would have also run into the same compilation error 
(even with the old dispatch, if I understand correctly).  Should that 
case (and similar ones) be added as regression tests?

Ok to commit?

Don

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