Fix a bug that occurs when functions are defined with more than 16,382 parame...

src/x64/codegen-x64.cc

Index: src/x64/codegen-x64.cc
===================================================================
--- src/x64/codegen-x64.cc	(revision 6683)
+++ src/x64/codegen-x64.cc	(working copy)
@@ -2993,7 +2993,15 @@
   // Leave the frame and return popping the arguments and the
   // receiver.
   frame_->Exit();
-  masm_->ret((scope()->num_parameters() + 1) * kPointerSize);
+  int arguments_bytes = (scope()->num_parameters() + 1) * kPointerSize;
+  if (is_uint16(arguments_bytes)) {
+    __ ret(arguments_bytes);
+  } else {
+    __ pop(rcx);
+    __ addq(rsp, Immediate(arguments_bytes));
+    __ push(rcx);
+    __ ret(0);
+  }
   DeleteFrame();
 
 #ifdef ENABLE_DEBUGGER_SUPPORT
@@ -3006,8 +3014,8 @@
   }
   // Check that the size of the code used for returning matches what is
   // expected by the debugger.
-  ASSERT_EQ(Assembler::kJSReturnSequenceLength,
-            masm_->SizeOfCodeGeneratedSince(&check_exit_codesize));
+  ASSERT(Assembler::kJSReturnSequenceLength <=
+         masm_->SizeOfCodeGeneratedSince(&check_exit_codesize));
 #endif
 }