Revert "VM: New calling convention for generated code."

runtime/vm/instructions_x64.h

Index: runtime/vm/instructions_x64.h
diff --git a/runtime/vm/instructions_x64.h b/runtime/vm/instructions_x64.h
index 5d7616dd4064dfc54aba279c26c01be4e05c0841..4c4aae833deaf66594d7c7f48adeebf5ae450fd3 100644
--- a/runtime/vm/instructions_x64.h
+++ b/runtime/vm/instructions_x64.h
@@ -65,6 +65,30 @@ template<class P> class InstructionPattern : public ValueObject {
 };
 
 
+class JumpPattern : public InstructionPattern<JumpPattern> {
+ public:
+  JumpPattern(uword pc, const Code& code)
+      : InstructionPattern(pc),
+        object_pool_(ObjectPool::Handle(code.GetObjectPool())) {}
+
+  uword TargetAddress() const;
+  void SetTargetAddress(uword new_target) const;
+
+  static const int kLengthInBytes = 7;
+  static int pattern_length_in_bytes() { return kLengthInBytes; }
+  static const int* pattern() {
+    //  07: 41 ff a7 imm32  jmpq [reg + off]
+    static const int kJumpPattern[kLengthInBytes] =
+        {0x41, 0xFF, -1, -1, -1, -1, -1};
+    return kJumpPattern;
+  }
+ private:
+  const ObjectPool& object_pool_;
+
+  DISALLOW_COPY_AND_ASSIGN(JumpPattern);
+};
+
+
 // 5 byte call instruction.
 class ShortCallPattern : public InstructionPattern<ShortCallPattern> {
  public: