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The `lowerMSASplatImm` function zero-extends `i32` immediates while building constant. If target type is `i64`, negative immediate loses the sign. As a result, for example `__builtin_msa_ldi_d(-1)` lowered to series of instruction loads incorrect value 0xffffffff to the `$w0` register instead of single `ldi.d $w0, -1` instruction. The fix zero-extends unsigned immediates and signed-extend signed immediates. Differential Revision: http://reviews.llvm.org/D59884 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@357264 91177308-0d34-0410-b5e6-96231b3b80d8