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'add r2, #-1024' should just use 'sub r2, #1024' rather than erroring out. Thumb1 aliases for adding a negative immediate to the stack pointer, also. rdar://11192734 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154123 91177308-0d34-0410-b5e6-96231b3b80d8