[Experiment] JIT: fold reference equality for provably unrelated types

[EgorBo]

boolFoo(ClassAa,ClassBb){if(a!=null){returnobject.ReferenceEquals(a,b);}returnfalse;}

- test rcx, rcx- je SHORT G_M47830_IG05- cmp rcx, rdx- sete al- movzx rax, al- ret- xor eax, eax- ret+ xor eax, eax+ ret

[EgorBo]

@MihuBot -nuget

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[EgorBo]

@MihuBot -nuget

[EgorBo]

diffs aren't motivating