[patch] Fix subset of subsets; fix IPP FIR backend bug

[Jules Bergmann]

This patch fixes two bugs:

First, it fixes handling of subset views of distributed subset views. 
Previously this worked, but my recent patch to support more arbitrary 
distributed subset views broke this.

The fix is to add a specialization of Map_subdomain for Subset_map. 
However, this created a header dependency loop between subset_map.hpp, 
vector.hpp, and subblock.hpp, because maps' processor_set function 
returns a vector.  I broke this loop by moving forward declarations of 
views into view_fwd.hpp, and by splitting subset_map.hpp into 
subset_map_decl.hpp and subset_map.hpp.  subset_map_decl.hpp contains 
the core declarations of subset_map.hpp, but does not actually require a 
definition of Vector.  subblock.hpp now includes subset_map_decl.hpp.

A new regression test (regressions/subset.cpp) covers this case.

Second, it fixes a bug in the IPP FIR backend, which was not mirroring 
symmetric kernels properly.

Patch applied.

				-- Jules




-- 
Jules Bergmann
CodeSourcery
jules at codesourcery.com
(650) 331-3385 x705
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