[mips] Fix unsigned/signed type error
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 llvm-svn: 287099
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