[turbofan] Typed lowering requires typed nodes.
[turbofan] Typed lowering requires typed nodes.

There's no point in checking whether a node is typed in JSTypedLowering.

R=jarin@chromium.org

Review URL: https://codereview.chromium.org/1086303002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#27863}

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh