Iasm and obj lowering for advanced switch lowering.

src/IceAssemblerX8664.h

Index: src/IceAssemblerX8664.h
diff --git a/src/IceAssemblerX8664.h b/src/IceAssemblerX8664.h
index f2ffd7f4ee48ede97d9421f2dc5e5894788022e7..d4ce341e1018fc2b7b1d416c86ae779db8db4112 100644
--- a/src/IceAssemblerX8664.h
+++ b/src/IceAssemblerX8664.h
@@ -36,10 +36,12 @@ public:
   ~AssemblerX8664() override = default;
 
   void alignFunction() override;
+  void alignCfgNode() override;
   void padWithNop(intptr_t Padding) override;
   SizeT getBundleAlignLog2Bytes() const override;
   const char *getNonExecPadDirective() const override;
   llvm::ArrayRef<uint8_t> getNonExecBundlePadding() const override;
+  Label *getOrCreateCfgNodeLabel(SizeT NodeNumber) override;
   void bindCfgNodeLabel(SizeT NodeNumber) override;
   bool fixupIsPCRel(FixupKind Kind) const override;