[compiler] Remove support for concurrent OSR.

src/ppc/builtins-ppc.cc

Index: src/ppc/builtins-ppc.cc
diff --git a/src/ppc/builtins-ppc.cc b/src/ppc/builtins-ppc.cc
index f0b76ccc39c88cdc8c9b2b79a5b7711da5cda9cf..09b7060ec3c32e6552a7283a4464ec224383f1e0 100644
--- a/src/ppc/builtins-ppc.cc
+++ b/src/ppc/builtins-ppc.cc
@@ -1454,24 +1454,6 @@ 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;
-  __ LoadRoot(ip, Heap::kStackLimitRootIndex);
-  __ cmpl(sp, ip);
-  __ bge(&ok);
-  {
-    FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
-    __ CallRuntime(Runtime::kStackGuard);
-  }
-  __ Jump(masm->isolate()->builtins()->OnStackReplacement(),
-          RelocInfo::CODE_TARGET);
-
-  __ bind(&ok);
-  __ Ret();
-}
-
-
 // static
 void Builtins::Generate_DatePrototype_GetField(MacroAssembler* masm,
                                                int field_index) {