Introduce model of global initializers in Subzero.

src/IceTargetLowering.h

Index: src/IceTargetLowering.h
diff --git a/src/IceTargetLowering.h b/src/IceTargetLowering.h
index 1995124826d066cffd229671e1bc4066c58e9162..993cbe8e0ad352b547740f8db6c1faae172c41f7 100644
--- a/src/IceTargetLowering.h
+++ b/src/IceTargetLowering.h
@@ -19,6 +19,7 @@
 #define SUBZERO_SRC_ICETARGETLOWERING_H
 
 #include "IceDefs.h"
+#include "IceGlobalInits.h"
 #include "IceInst.h" // for the names of the Inst subtypes
 #include "IceTypes.h"
 
@@ -243,10 +244,7 @@ public:
                                                   GlobalContext *Ctx);
   virtual ~TargetGlobalInitLowering();
 
-  // TODO: Allow relocations to be represented as part of the Data.
-  virtual void lower(const IceString &Name, SizeT Align, bool IsInternal,
-                     bool IsConst, bool IsZeroInitializer, SizeT Size,
-                     const char *Data, bool DisableTranslation) = 0;
+  virtual void lower(const GlobalAddress &Addr, bool DisableTranslation) = 0;
 
 protected:
   TargetGlobalInitLowering(GlobalContext *Ctx) : Ctx(Ctx) {}