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This allows us to insert some hooks before emitting data into an actual object file. For example, we can capture the register usage for a translation unit by overriding the EmitInstruction method. The register usage information is needed to generate .reginfo and .Mips.options ELF sections. No functional changes. Differential Revision: http://llvm-reviews.chandlerc.com/D3129 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204917 91177308-0d34-0410-b5e6-96231b3b80d8