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[CodeGenPrepare] Remove load-based heuristic
Summary: Both the hardware and LLVM have changed since 2012. Now, load-based heuristic don't show big differences any more on OoO cores. There is no notable regressons and improvements on spec2000/2006. (Cortex-A57, Core i5). Reviewers: spatel, zansari Differential Revision: http://reviews.llvm.org/D16836 llvm-svn: 261809
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