Use <0 checks in place of ==-1 because it results in simpler code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173010 91177308-0d34-0410-b5e6-96231b3b80d8

Author: topperc

lib/Target/X86/X86ISelLowering.cpp

@@ -5678,12 +5678,12 @@ LowerVECTOR_SHUFFLEtoBlend(ShuffleVectorSDNode *SVOp,
       SVOp->getMaskElt(i + NumElemsInLane) : -1;
     int EltIdx = SVOp->getMaskElt(i);
 
-    if ((EltIdx == -1 || EltIdx == (int)i) &&
-        (SndLaneEltIdx == -1 || SndLaneEltIdx == (int)(i + NumElemsInLane)))
+    if ((EltIdx < 0 || EltIdx == (int)i) &&
+        (SndLaneEltIdx < 0 || SndLaneEltIdx == (int)(i + NumElemsInLane)))
       continue;
 
     if (((unsigned)EltIdx == (i + NumElems)) &&
-        (SndLaneEltIdx == -1 ||
+        (SndLaneEltIdx < 0 ||
          (unsigned)SndLaneEltIdx == i + NumElems + NumElemsInLane))
       MaskValue |= (1<<i);
     else