Merge branch 'barry/2021-02-12/add-baij-12' into 'main'

Barry/2021 02 12/add baij 12

See merge request petsc/petsc!3643

CI: arch-ci-linux-gcc-complex-opt.py -> arch-ci-linux-gcc-complex-opt-32bit.py

Fix bug in ex4.c Code assumed that floating point product would produce exact result

/spend 3h
Reported-by: Gitlab CI

Print additional information on PetscMallocValidate() errors

Add new mat/tests example for testing performance of BAIJ for different block sizes

Add support for options database controln of which version of MatMult_SeqBAIJ is used

Add support for block size

Add new mat/tests example for testing performance of BAIJ for different block sizes

Add support for options database controln of which version of MatMult_SeqBAIJ is used

Add support for block size 12 include AVX (no faster)

Fixes for MatMult_SeqBAIJ_12_AVX2()- Code, was cut and paste and not properly fixed, so completely wrong before

Clean up test example for MatMult BAIJ blocksize 12

Commit-type: optimization
/spend 5.5h
Reported-by: Asiri Obeysekara <gitlab@mg.gitlab.com>

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