[super ic] Fix receiver type
With non-super loads (receiver == lookup_start_object), we don't hit the code in AccessorAssembler::GenericPropertyLoad calling CSA::TryGetOwnProperty if the receiver (the lookup_start_object) is a SMI. But with super property loads, if we set up lookup_start_object the right way, we will hit this code. The code was assuming receiver is a HeapObject, which is too restrictive. The receiver is only used for the accessor call, so it's ok to make the type more generic. Bug: v8:9237, chromium:1139786 Change-Id: I3167ccfb54a49ac1c401040a6f02fc1f3b98d9d1 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2484366Reviewed-by:Igor Sheludko <ishell@chromium.org> Commit-Queue: Marja Hölttä <marja@chromium.org> Cr-Commit-Position: refs/heads/master@{#70647}
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