Fix a bug that would cause subzero to fail when --threads=0.

src/IceTargetLoweringMIPS32.h

Index: src/IceTargetLoweringMIPS32.h
diff --git a/src/IceTargetLoweringMIPS32.h b/src/IceTargetLoweringMIPS32.h
index 9204833a7b8a9cb77fdcc69a9f9f4260aa7f58d6..cb89ffc24bf69eee1c8787bfdcd261938e3973a3 100644
--- a/src/IceTargetLoweringMIPS32.h
+++ b/src/IceTargetLoweringMIPS32.h
@@ -137,7 +137,8 @@ public:
     return std::unique_ptr<TargetDataLowering>(new TargetDataMIPS32(Ctx));
   }
 
-  void lowerGlobals(std::unique_ptr<VariableDeclarationList> Vars) override;
+  void lowerGlobals(const VariableDeclarationList &Vars,
+                    const IceString &SectionSuffix) override;
   void lowerConstants() override;
 
 protected: