[vm/aot] Add machine readable precompiler trace This CL adds --trace-precompiler-to option which generates a machine readable precompiler trace (list of all compiled functions and their dependencies). It also expands package:vm_snapshot_analysis with tools for reading and analysing this trace. For example snapshot_analysis explain dynamic-calls command allows to list all dynamic calls sorted by their impact on the size of the AOT snapshot. Issue https://github.com/dart-lang/sdk/issues/41249 Cq-Include-Trybots: luci.dart.try:pkg-linux-debug-try,pkg-linux-release-try,pkg-win-release-try,pkg-mac-release-try Change-Id: Ie49143f4da375067991991e2ad20a41ec67bb1c3 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/152851 Commit-Queue: Vyacheslav Egorov <vegorov@google.com> Reviewed-by: Martin Kustermann <kustermann@google.com>
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