If you just cast those patterns to float or double and pass them
around, the quiet/signaling NaN bit might change. We had several bugs
around this, so add these patterns to the general input vectors.

This oncovers a bug in the wasm interpreter, which will be fixed in a
separate CL.

R=ahaas@chromium.org

Bug: v8:6947, v8:6954
Change-Id: I205b8ab784b087b1e4988190fa725df0b90e7ee0
Reviewed-on: https://chromium-review.googlesource.com/725345
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48731}