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Enabling merging of extern globals appears to be generally either beneficial or harmless. On some benchmarks suites (on Cortex-M4F, Cortex-A9, and Cortex-A57) it gives improvements in the 1-5% range, but in the rest the overall effect is zero. Differential Revision: http://reviews.llvm.org/D10966 llvm-svn: 243874
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