This adds new timed histograms to measure the time that TurboFan spends
on various compilation phases on a per function bases. This includes the
following new counters:

- V8.TurboFanOptimizePrepare
  Time spent in the preparation phase of TurboFan optimization. Recorded
  on each regular optimization of a function.
- V8.TurboFanOptimizeExecute
  Time spent in the execution phase of TurboFan optimization. Recorded on
  each regular optimization of a function.
- V8.TurboFanOptimizeFinalize
  Time spent in the finalization phase of TurboFan optimization. Recorded
  on each regular optimization of a function.
- V8.TurboFanOptimizeTotalForeground
  Total time spent on the main thread during TurboFan optimization.
  Recorded on each regular optimization of a function.
- V8.TurboFanOptimizeTotalBackground
  Total time spent on a background thread during TurboFan optimization.
  Recorded on each regular optimization of a function.
- V8.TurboFanOptimizeTotalTime
  Total time from starting optimizing to installing the code object.
  Recorded on each regular optimization of a function.
- V8.TurboFanOptimizeForOnStackReplacementPrepare
  Time spent in the preparation phase of TurboFan optimization for On
  Stack Replacement (OSR). Recorded on each optimization  for on-stack
  replacement of a function.
- V8.TurboFanOptimizeForOnStackReplacementExecute
  Time spent in the execution phase of TurboFan optimization for On Stack
  Replacement (OSR). Recorded on each optimization  for on-stack replacement
  of a function.
- V8.TurboFanOptimizeForOnStackReplacementFinalize
  Time spent in the finalization phase of TurboFan optimization for On Stack
  Replacement (OSR). Recorded on each optimization  for on-stack replacement
  of a function.
- V8.TurboFanOptimizeForOnStackReplacementTotalTime
  Total time from starting optimizing for On Stack Replacement (OSR) to
  installing the code object. Recorded on each optimization for on-stack
  replacement of a function.

This should give us a good overview and guide/validate future work on
the concurrent optimization pipeline.

Bug: v8:7790, v8:9074
Change-Id: I96573cd1da472684d06624b7573e4afd6efca99c
Doc: http://doc/1umgFxjLQ9p22lVS_BdhmAlo1o9xnxnWlhVi_HMWNktM
Cq-Include-Trybots: luci.chromium.try:linux-blink-rel
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1547864
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
Auto-Submit: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60604}