Cleanup: Replace LoadInstanceFieldInstr with LoadVMFieldInstr.

runtime/vm/intermediate_language.h

Index: runtime/vm/intermediate_language.h
===================================================================
--- runtime/vm/intermediate_language.h	(revision 12267)
+++ runtime/vm/intermediate_language.h	(working copy)
@@ -208,7 +208,6 @@
   M(NativeCall)                                                                \
   M(LoadIndexed)                                                               \
   M(StoreIndexed)                                                              \
-  M(LoadInstanceField)                                                         \
   M(StoreInstanceField)                                                        \
   M(LoadStaticField)                                                           \
   M(StoreStaticField)                                                          \
@@ -2130,31 +2129,6 @@
 };
 
 
-class LoadInstanceFieldInstr : public TemplateDefinition<1> {
- public:
-  LoadInstanceFieldInstr(const Field& field, Value* instance) : field_(field) {
-    ASSERT(instance != NULL);
-    inputs_[0] = instance;
-  }
-
-  DECLARE_INSTRUCTION(LoadInstanceField)
-  virtual RawAbstractType* CompileType() const;
-
-  const Field& field() const { return field_; }
-  Value* instance() const { return inputs_[0]; }
-
-  virtual void PrintOperandsTo(BufferFormatter* f) const;
-
-  virtual bool CanDeoptimize() const { return false; }
-  virtual intptr_t ResultCid() const { return kDynamicCid; }
-
- private:
-  const Field& field_;
-
-  DISALLOW_COPY_AND_ASSIGN(LoadInstanceFieldInstr);
-};
-
-
 class StoreInstanceFieldInstr : public TemplateDefinition<2> {
  public:
   StoreInstanceFieldInstr(const Field& field,