[turbofan] Macro-ify the tracing code in RegisterAllocator.
[turbofan] Macro-ify the tracing code in RegisterAllocator.

R=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1014093008

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#27418}

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh