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MipsFastISel uses a a class to represent addresses with a signed member to represent the offset. MipsFastISel::emitStore, emitLoad and computeAddress all treated the offset as being positive. In cases where the offset was actually negative and a frame pointer was used, this would cause the constant synthesis routine to crash as it would generate an unexpected instruction sequence when frame indexes are replaced. Reviewers: vkalintiris Differential Revision: https://reviews.llvm.org/D26192 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@287099 91177308-0d34-0410-b5e6-96231b3b80d8