Implement RTTI related runtime support.
Implement RTTI related runtime support.

For passing IntMath test.

Change-Id: I1d2a23480c2848e0834f5d2a6169a480e4498631

treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst