[turbolizer] Add support for showing perf profiling information.

tools/turbolizer/README

Index: tools/turbolizer/README
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-Turbolizer is a HTML-based tool that visualizes optimized code along the various
-phases of Turbofan's optimization pipeline, allowing easy navigation between
-source code, Turbofan IR graphs, scheduled IR nodes and generated assembly code.
-
-Turbolizer consumes .json files that are generated per-function by d8 by passing
-the '--trace-turbo' command-line flag.
-
-Host the turbolizer locally by starting a web server that serves the contents of
-the turbolizer directory, e.g.:
-
-cd src/tools/turbolizer
-python -m SimpleHTTPServer 8000
-
-Graph visualization and manipulation based on Mike Bostock's sample code for an
-interactive tool for creating directed graphs. Original source is at
-https://github.com/metacademy/directed-graph-creator and released under the
-MIT/X license.
-
-Icons dervied from the "White Olive Collection" created by Breezi released under
-the Creative Commons BY license.