Add unittests: compare BigUint(0) to 0UL

to prevent regression of bug 12234.
[ARM] Some FPUs do not support exception trapping, disable test
Merge pull request #1962 from gittywithexcitement/master

Add unittests: compare BigUint(0) to 0UL
Merge pull request #1961 from jpf91/armFPU

[ARM] Some FPUs do not support exception trapping, disable test