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Summary: In profiling our app, we found that the usage of `merge` in `Text.js` was showing up as a hotspot. We've replaced this usage of `merge` with `mergeFast`. **Test plan (required)** This change is used in my team's app. Adam Comella Microsoft Corp. Closes #9654 Differential Revision: D3801791 fbshipit-source-id: 004652ed6537b557d00541ab2e5fbe64b56fa73b
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