[compiler] Remove support for concurrent OSR.

src/ppc/builtins-ppc.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 1436 matching lines @@
     // Compute the target address = code start + osr_offset
     __ add(r0, r3, r4);
 
     // And "return" to the OSR entry point of the function.
     __ mtlr(r0);
     __ blr();
   }
 }
 
 
-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) {
   // ----------- S t a t e -------------
   //  -- lr    : return address
   //  -- sp[0] : receiver
   // -----------------------------------
 
   // 1. Pop receiver into r3 and check that it's actually a JSDate object.
   Label receiver_not_date;
@@ skipping 1166 matching lines @@
     __ bkpt(0);
   }
 }
 
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC