[TurboFan] Fix type checks for lowering SpeculativeNumberBinop.
Ensure we only lower SpeculativeNumberBinops to a pure operator for non-string plain primitives. Previously we could lower if a value might be the-hole, however this would fail a CHECK in ConvertInputsToNumber which expects a plain primitive. BUG=chromium:772420 Change-Id: I0c755d10db7afd9cabfb638eca5662d70dfc8d51 Reviewed-on: https://chromium-review.googlesource.com/715717 Commit-Queue: Ross McIlroy <rmcilroy@chromium.org> Reviewed-by: Jaroslav Sevcik <jarin@chromium.org> Cr-Commit-Position: refs/heads/master@{#48649}
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