sameRuntimeType() function

[Hixie]

In #49113 (comment) @lrhn suggests:

an external static bool sameRuntimeType(Object? o1, Object o2); on Type that you could use to compare runtime types without reifying them, like we do with identical and identityHashCode for identity

[mraleph]

I guess it's just about removing _ here:

sdk/sdk/lib/_internal/vm/lib/object_patch.dart

Lines 47 to 51 in e51af7c

	@pragma("vm:recognized", "asm-intrinsic")
	@pragma("vm:entry-point", "call")
	@pragma("vm:exact-result-type", bool)
	@pragma("vm:external-name", "Object_haveSameRuntimeType")
	external static bool _haveSameRuntimeType(a, b);

[lrhn]

We'll need that function on all platforms before it can be used in user code (or general SDK code), so it's not just the VM.