This commit changes the pararmeter names in the comment for
NewConsString which currently do not match the actual parameter names in
the function definition or the declaration in code-stub-assembler.cc.

Bug: 
Change-Id: I162a2027cc37512de8a09e520a1fb13c9445fa97
Reviewed-on: https://chromium-review.googlesource.com/657017Reviewed-by: Daniel Clifford <danno@chromium.org>
Commit-Queue: Daniel Clifford <danno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48964}