Fix instance of PrintRegisters only seen by compiler if
V8_TRACE_IGNITION is set.

Bug: v8:7786
Change-Id: I512e0ac111d61ff586c6cfa4a41878792a834602
Reviewed-on: https://chromium-review.googlesource.com/1087458Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Dan Elphick <delphick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53540}