YJIT: Avoid leaks by skipping objects with a singleton class

For receiver with a singleton class, there are multiple vectors YJIT can
end up retaining the object. There is a path in jit_guard_known_klass()
that bakes the receiver into the code, and the object could also be kept
alive indirectly through a path starting at the CME object baked into
the code.

To avoid these leaks, avoid compiling calls on objects with a singleton
class.

See: https://github.com/Shopify/ruby/issues/552

[Bug #20209]

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