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This adds support for generating Chrome-tracing .json profile traces in the LLD COFF driver. Also add the necessary time scopes, so that the profile trace shows in great detail which tasks are executed. As an example, this is what we see when linking a Unreal Engine executable: 
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===========================
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lld |release| Release Notes
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===========================
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.. contents::
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:local:
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.. only:: PreRelease
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.. warning::
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These are in-progress notes for the upcoming LLVM |release| release.
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Release notes for previous releases can be found on
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`the Download Page <https://releases.llvm.org/download.html>`_.
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Introduction
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============
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This document contains the release notes for the lld linker, release |release|.
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Here we describe the status of lld, including major improvements
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from the previous release. All lld releases may be downloaded
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from the `LLVM releases web site <https://llvm.org/releases/>`_.
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Non-comprehensive list of changes in this release
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=================================================
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ELF Improvements
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----------------
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* ``--fat-lto-objects`` option is added to support LLVM FatLTO.
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Without ``--fat-lto-objects``, LLD will link LLVM FatLTO objects using the
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relocatable object file. (`D146778 <https://reviews.llvm.org/D146778>`_)
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* common-page-size can now be larger than the system page-size.
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(`#57618 <https://github.com/llvm/llvm-project/issues/57618>`_)
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Breaking changes
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----------------
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COFF Improvements
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-----------------
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* Added support for ``--time-trace`` and associated ``--time-trace-granularity``.
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This generates a .json profile trace of the linker execution.
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MinGW Improvements
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------------------
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MachO Improvements
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------------------
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WebAssembly Improvements
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------------------------
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Fixes
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#####
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