Subzero, MIPS32: Randomly insert NOP

src/IceTargetLoweringMIPS32.h

Index: src/IceTargetLoweringMIPS32.h
diff --git a/src/IceTargetLoweringMIPS32.h b/src/IceTargetLoweringMIPS32.h
index 8029386576e3d9f16dbe0a4cde8576bc6c5541d4..5cc412f2ad290bb27adcff09cc36b0c1945bf127 100644
--- a/src/IceTargetLoweringMIPS32.h
+++ b/src/IceTargetLoweringMIPS32.h
@@ -419,6 +419,8 @@ public:
     Context.insert<InstMIPS32Multu>(Dest, Src0, Src1);
   }
 
+  void _nop() { Context.insert<InstMIPS32Sll>(getZero(), getZero(), 0); }
+
   void _or(Variable *Dest, Variable *Src0, Variable *Src1) {
     Context.insert<InstMIPS32Or>(Dest, Src0, Src1);
   }