ReferenceEquals call should be replaced with equivalent IL (when possible)

[ndrwrbgs]

I deleted the template, I'm a bad patron :(

Made unit test to try to compare the weave results against what the compiler would do (so instead of having a comment in the readme.md about what it's similar to, we could assert it's the same as that!) -- master...ndrwrbgs:testTheActualIL

However, note the TODOs in the test file

TODO: The compiler optimizes ReferenceEquals in Equals to brfalse and beq.s, we should also

master...ndrwrbgs:testTheActualIL#diff-487b86d49e3d25f0b2efe6336d19cc22R557

We should try to match what the compiler does in these cases, and prefer brfalse/beq.s instead of the call to object.ReferenceEquals, if that's the right thing to do.