Implement inlining of constructor calls.

src/x64/lithium-x64.h

Index: src/x64/lithium-x64.h
diff --git a/src/x64/lithium-x64.h b/src/x64/lithium-x64.h
index 6c132a247e9e730942d8864797cd97ea5670a558..1c0761ebf1f14e4d22d72af02f45190237402242 100644
--- a/src/x64/lithium-x64.h
+++ b/src/x64/lithium-x64.h
@@ -49,6 +49,7 @@ class LCodeGen;
 #define LITHIUM_CONCRETE_INSTRUCTION_LIST(V)    \
   V(AccessArgumentsAt)                          \
   V(AddI)                                       \
+  V(AllocateObject)                             \
   V(ApplyArguments)                             \
   V(ArgumentsElements)                          \
   V(ArgumentsLength)                            \
@@ -1898,6 +1899,13 @@ class LCheckNonSmi: public LTemplateInstruction<0, 1, 0> {
 };
 
 
+class LAllocateObject: public LTemplateInstruction<1, 0, 0> {
+ public:
+  DECLARE_CONCRETE_INSTRUCTION(AllocateObject, "allocate-object")
+  DECLARE_HYDROGEN_ACCESSOR(AllocateObject)
+};
+
+
 class LArrayLiteral: public LTemplateInstruction<1, 0, 0> {
  public:
   DECLARE_CONCRETE_INSTRUCTION(ArrayLiteral, "array-literal")