VM: Small generated code size improvements on x64.

runtime/vm/code_patcher_ia32.cc

Index: runtime/vm/code_patcher_ia32.cc
===================================================================
--- runtime/vm/code_patcher_ia32.cc	(revision 42687)
+++ runtime/vm/code_patcher_ia32.cc	(working copy)
@@ -150,51 +150,6 @@
 };
 
 
-// The expected pattern of a Dart closure call:
-//   mov EDX, arguments_descriptor_array
-//   call target_address
-//   <- return address
-class ClosureCall : public ValueObject {
- public:
-  explicit ClosureCall(uword return_address)
-      : start_(return_address - (kInstr1Size + kInstr2Size)) {
-    ASSERT(IsValid(return_address));
-    ASSERT(kInstr2Size == Assembler::kCallExternalLabelSize);
-  }
-
-  static bool IsValid(uword return_address) {
-    uint8_t* code_bytes = reinterpret_cast<uint8_t*>(
-        return_address - (kInstr1Size + kInstr2Size));
-    return (code_bytes[0] == 0xBA) && (code_bytes[kInstr1Size] == 0xE8);
-  }
-
-  RawArray* arguments_descriptor() const {
-    return *reinterpret_cast<RawArray**>(start_ + 1);
-  }
-
- private:
-  static const int kInstr1Size = 5;  // mov EDX, arguments descriptor array
-  static const int kInstr2Size = 5;  // call stub
-
-  uword return_address() const {
-    return start_ + kInstr1Size + kInstr2Size;
-  }
-  uword call_address() const { return start_; }
-
-  uword start_;
-  DISALLOW_IMPLICIT_CONSTRUCTORS(ClosureCall);
-};
-
-
-
-RawArray* CodePatcher::GetClosureArgDescAt(uword return_address,
-                                           const Code& code) {
-  ASSERT(code.ContainsInstructionAt(return_address));
-  ClosureCall call(return_address);
-  return call.arguments_descriptor();
-}
-
-
 uword CodePatcher::GetStaticCallTargetAt(uword return_address,
                                          const Code& code) {
   ASSERT(code.ContainsInstructionAt(return_address));