[turbofan] change tracing in scheduler so block_id is id: instead of B and rpo_number is now B
[turbofan] change tracing in scheduler so block_id is id: instead of B and rpo_number is now B

R=mstarzinger@chromium.org

BUG=

Review URL: https://codereview.chromium.org/948263004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#26866}

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