[XRay][tools] Use Support/JSON.h in llvm-xray convert
Summary:
This change removes the ad-hoc implementation used by llvm-xray's
`convert` subcommand to generate JSON encoded catapult (AKA Chrome
Trace Viewer) trace output, to instead use the JSON encoder now in the
Support library.
Reviewers: kpw, zturner, eizan
Reviewed By: kpw
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D50129
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@338834
91177308-0d34-0410-b5e6-
96231b3b80d8
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