Iasm and obj lowering for advanced switch lowering.

src/IceTargetLowering.h

Index: src/IceTargetLowering.h
diff --git a/src/IceTargetLowering.h b/src/IceTargetLowering.h
index e87bf936bbea58ec92b84e5f3236671e90337197..8d70d247a71e78ee132066c047d4b2afe0b07011 100644
--- a/src/IceTargetLowering.h
+++ b/src/IceTargetLowering.h
@@ -176,6 +176,7 @@ public:
   void updateStackAdjustment(int32_t Offset) { StackAdjustment += Offset; }
   void resetStackAdjustment() { StackAdjustment = 0; }
   SizeT makeNextLabelNumber() { return NextLabelNumber++; }
+  SizeT makeNextJumpTableNumber() { return NextJumpTableNumber++; }
   LoweringContext &getContext() { return Context; }
 
   enum RegSet {
@@ -211,6 +212,8 @@ public:
   /// Get the minimum number of clusters required for a jump table to be
   /// considered.
   virtual SizeT getMinJumpTableSize() const = 0;
+  virtual void emitJumpTable(const Cfg *Func,
+                             const InstJumpTable *JumpTable) const = 0;
 
   virtual void emitVariable(const Variable *Var) const = 0;
 
@@ -337,6 +340,7 @@ protected:
   /// natural location, as arguments are pushed for a function call.
   int32_t StackAdjustment = 0;
   SizeT NextLabelNumber = 0;
+  SizeT NextJumpTableNumber = 0;
   LoweringContext Context;
 
   // Runtime helper function names
@@ -396,6 +400,7 @@ public:
   virtual void lowerGlobals(const VariableDeclarationList &Vars,
                             const IceString &SectionSuffix) = 0;
   virtual void lowerConstants() = 0;
+  virtual void lowerJumpTables() = 0;
 
 protected:
   void emitGlobal(const VariableDeclaration &Var,