RFR: 8373626: [asan] read past end of buffer in sun.awt.image.ImagingLib.convolveBI [v2]

[Phil Race]

> Some of the medialib native functions implementing Convolve read data from arrays when it is not needed or used instead of reading just what is needed and used.
> This is detected as a read out of bounds. It is limited and hasn't been seen to result in any crashes without ASAN, and the OOB values that are read are never used so there's a very limited problem.
> The changes here make the mlib_ImageConv_*nw.c files match what happens in the mlib_ImageConv_*ext.c files which read just the data they need.
> The changes are fairly mechanical but there could be copy/paste errors for a reviewer to find.
> 
> Not easy to provide a test case, building with --enable-asan is needed and for me it works only on macOS.
> I did that and ran all our existing automated tests on our CI systems.

Phil Race has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains two commits:

 - Merge
 - 8373626

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Changes: https://git.openjdk.org/jdk/pull/29257/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29257&range=01
  Stats: 435 lines in 7 files changed: 357 ins; 54 del; 24 mod
  Patch: https://git.openjdk.org/jdk/pull/29257.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29257/head:pull/29257

PR: https://git.openjdk.org/jdk/pull/29257