Merge ConstantInstr -> UnboxDouble to UnboxedConstant. Reduces register usage and allows for variou…

runtime/vm/intermediate_language.h

Index: runtime/vm/intermediate_language.h
===================================================================
--- runtime/vm/intermediate_language.h	(revision 35632)
+++ runtime/vm/intermediate_language.h	(working copy)
@@ -721,6 +721,7 @@
   M(CheckClass)                                                                \
   M(CheckSmi)                                                                  \
   M(Constant)                                                                  \
+  M(UnboxedConstant)                                                           \
   M(CheckEitherNonSmi)                                                         \
   M(BinaryDoubleOp)                                                            \
   M(MathUnary)                                                                 \
@@ -2745,6 +2746,29 @@
 };
 
 
+// Merged ConstantInstr -> UnboxedXXX into UnboxedConstantInstr.
+// TODO(srdjan): Implemented currently for doubles only, should implement
+// for other unboxing instructions.
+class UnboxedConstantInstr : public ConstantInstr {
+ public:
+  explicit UnboxedConstantInstr(const Object& value);
+
+  virtual Representation representation() const {
+    return kUnboxedDouble;
+  }
+
+  // Either NULL or the address of the unboxed constant.
+  uword constant_address() const { return constant_address_; }
+
+  DECLARE_INSTRUCTION(UnboxedConstant)
+
+ private:
+  uword constant_address_;  // Either NULL or points to the untagged constant.
+
+  DISALLOW_COPY_AND_ASSIGN(UnboxedConstantInstr);
+};
+
+
 class AssertAssignableInstr : public TemplateDefinition<3> {
  public:
   AssertAssignableInstr(intptr_t token_pos,