Test OMR regularly with Runtime Sanitizers

[mgaudet]

Like most projects written in C++, OMR would benefit from being run regularly with runtime sanitizer builds.

The support to enable this was merged as part of #2008, and so this should just be a matter of selecting the sanitizers, ensuring they're clean, and then adding new builds to ensure they're clean.

Sanitizers have already found bugs in OMR, for example

• Undefined Behaviour in AMD64 Trampoline #1793
• Signed Integer Overflow in TR_RandomSeedSignatureHash #1794
• Static Polymorphic Construction: A Flaw in Extensible Classes  #1797
• Move initialization of JitOptTest _strategy #1791

My recommendation would be to start by running with the address sanitizer, and then work on cleaning up the undefined behaviour.