Subzero: Remove IceString.

src/IceSwitchLowering.h

Index: src/IceSwitchLowering.h
diff --git a/src/IceSwitchLowering.h b/src/IceSwitchLowering.h
index 5b9f673e302394595433c6abf51d1f7a956b35d8..d4f5291d0601e673ca33302978b1762e521e5169 100644
--- a/src/IceSwitchLowering.h
+++ b/src/IceSwitchLowering.h
@@ -16,6 +16,7 @@
 #define SUBZERO_SRC_ICESWITCHLOWERING_H
 
 #include "IceDefs.h"
+#include "IceStringPool.h"
 
 namespace Ice {
 
@@ -84,19 +85,19 @@ class JumpTableData {
 public:
   using TargetList = std::vector<intptr_t>;
 
-  JumpTableData(const IceString &FuncName, SizeT Id,
+  JumpTableData(GlobalString FuncName, SizeT Id,
                 const TargetList &TargetOffsets)
       : FuncName(FuncName), Id(Id), TargetOffsets(TargetOffsets) {}
   JumpTableData(const JumpTableData &) = default;
   JumpTableData(JumpTableData &&) = default;
   JumpTableData &operator=(JumpTableData &&) = default;
 
-  const IceString &getFunctionName() const { return FuncName; }
+  const GlobalString getFunctionName() const { return FuncName; }
   SizeT getId() const { return Id; }
   const TargetList &getTargetOffsets() const { return TargetOffsets; }
 
 private:
-  IceString FuncName;
+  GlobalString FuncName;
   SizeT Id;
   TargetList TargetOffsets;
 };