[turbofan] Use reference equal to zero instead of a smi check.
In typed lowering we can use the ReferenceEqual simplified operator instead of ObjectIsSmi to check for context extensions. This generates the desired code. R=mstarzinger@chromium.org Review URL: https://codereview.chromium.org/1163963003 Cr-Commit-Position: refs/heads/master@{#28776}
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