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Add the minimal support necessary to select a function that returns the sum of two i32 values. This includes some support for argument/return lowering of i32 values through registers, as well as the handling of copy and add instructions throughout the GlobalISel pipeline. Differential Revision: https://reviews.llvm.org/D26677 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@289940 91177308-0d34-0410-b5e6-96231b3b80d8