When projection nodes are optimized, TempRegisters are used, which
don't check to see if the registers are already in use.
UseUniqueRegisters instead.

Change-Id: I6a327098067daa3328355380da666d404fcc8b46
Bug: v8:8202, v8:6532
Reviewed-on: https://chromium-review.googlesource.com/c/1259107Reviewed-by: Bill Budge <bbudge@chromium.org>
Commit-Queue: Deepti Gandluri <gdeepti@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56360}