MIPS: dspr2: added optimization for function FilterLoop26

affected functions: VFilter16, HFilter16, VFilter8 and HFilter8

Change-Id: Ib2fc41aaa00b10c2906d689bdc5a10f4568e70a8
remove br->error_ field

it's somewhat redundant with br->eos_

also make the status-check coherent.

Change-Id: I98e755e037d45acb0760baf2344bf11fb5fb5cda
prepare VP8LDecodeImage for incremental decode

- don't call VP8LClear() when there's no error (and let the caller do it)
- only initialize output once if state_ is not READ_DATA
- don't over-set dec->status_ = READ_DATA
- don't re-set dec->status_ if DecodeImageStream() fails
- remove unneeded dec->action_ field
- make ReadImageInfo() check br->eos_
- use ErrorStatusLossless() more consistently

Change-Id: Ica6e4b1c82e3fce8b1ce0274def551a886b73b0b
Merge "MIPS: dspr2: added optimization for function FilterLoop26"
Merge "prepare VP8LDecodeImage for incremental decode"
MIPS: dspr2: added optimization for function FilterLoop24

affected functions: VFilter16i, HFilter16i, VFilter8i and HFilter8i

Change-Id: I5d2bc7716e60e048a33d630fe4a86011bfb6d42e