[compiler] Remove support for concurrent OSR.

src/x64/builtins-x64.cc

Index: src/x64/builtins-x64.cc
diff --git a/src/x64/builtins-x64.cc b/src/x64/builtins-x64.cc
index 6c4419e08426860fcb4fb8aaecfa2c9a679b8610..82d585e18d5647cd6822611ac1d0e5c9341b1469 100644
--- a/src/x64/builtins-x64.cc
+++ b/src/x64/builtins-x64.cc
@@ -2727,23 +2727,6 @@ void Builtins::Generate_OnStackReplacement(MacroAssembler* masm) {
 }
 
 
-void Builtins::Generate_OsrAfterStackCheck(MacroAssembler* masm) {
-  // We check the stack limit as indicator that recompilation might be done.
-  Label ok;
-  __ CompareRoot(rsp, Heap::kStackLimitRootIndex);
-  __ j(above_equal, &ok);
-  {
-    FrameScope scope(masm, StackFrame::INTERNAL);
-    __ CallRuntime(Runtime::kStackGuard);
-  }
-  __ jmp(masm->isolate()->builtins()->OnStackReplacement(),
-         RelocInfo::CODE_TARGET);
-
-  __ bind(&ok);
-  __ ret(0);
-}
-
-
 #undef __
 
 }  // namespace internal