Subzero: Don't bother printing stack/frame ptr as part of LiveIn/LiveOut.

src/IceTargetLoweringMIPS32.h

Index: src/IceTargetLoweringMIPS32.h
diff --git a/src/IceTargetLoweringMIPS32.h b/src/IceTargetLoweringMIPS32.h
index a56aa421bd72b98a875a46910176f87646674a4c..76caefb815eaa5a61be14e87527ddec566d07126 100644
--- a/src/IceTargetLoweringMIPS32.h
+++ b/src/IceTargetLoweringMIPS32.h
@@ -48,6 +48,7 @@ public:
     return RegisterAliases[Reg];
   }
   bool hasFramePointer() const override { return UsesFramePointer; }
+  SizeT getStackReg() const override { return RegMIPS32::Reg_SP; }
   SizeT getFrameOrStackReg() const override {
     return UsesFramePointer ? RegMIPS32::Reg_FP : RegMIPS32::Reg_SP;
   }