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[LSan] Disable backtracing for the lsan builds.
We don't need or want it there, and it's causing dependency problems in our CMake build system.
rdar://110420951
@swift-ci Please test
Explanation: The LSan builds fail because of a build system issue; Concurrency is disabled but somehow it's still being added as a dependency of Backtracing, which is wrong. This works around the problem by disabling Backtracing for LSan builds. Risk: Low. Original PR: #66436 Reviewed by: @etcwilde Resolves: rdar://110420951 Tests: This fixes a build failure in CI.