The current name for the operator (for printing) is "Extract lane",
without an indication of the shape. Add the shape (I32x4) and sign (for
I8x16 and I16x8, s or u) to the name so that it is clearer what
operation it is.

Change-Id: I1ab30dee5ae820c378cdef8233de1c365dd126c5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2534630Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71217}