[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
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@287099
91177308-0d34-0410-b5e6-
96231b3b80d8