Drop IsPregenerated() and allow_stub_calls flag.

src/arm/code-stubs-arm.h

Index: src/arm/code-stubs-arm.h
diff --git a/src/arm/code-stubs-arm.h b/src/arm/code-stubs-arm.h
index c03d8f27ec06cf7d777f96e466aa240f61b3128f..e4006861df080f0b70cd30be8fb472d5e773d6c8 100644
--- a/src/arm/code-stubs-arm.h
+++ b/src/arm/code-stubs-arm.h
@@ -68,7 +68,6 @@ class StoreBufferOverflowStub: public PlatformCodeStub {
 
   void Generate(MacroAssembler* masm);
 
-  virtual bool IsPregenerated(Isolate* isolate) V8_OVERRIDE { return true; }
   static void GenerateFixedRegStubsAheadOfTime(Isolate* isolate);
   virtual bool SometimesSetsUpAFrame() { return false; }
 
@@ -231,7 +230,6 @@ class WriteInt32ToHeapNumberStub : public PlatformCodeStub {
         the_heap_number_(the_heap_number),
         scratch_(scratch) { }
 
-  virtual bool IsPregenerated(Isolate* isolate) V8_OVERRIDE;
   static void GenerateFixedRegStubsAheadOfTime(Isolate* isolate);
 
  private:
@@ -279,8 +277,6 @@ class RecordWriteStub: public PlatformCodeStub {
     INCREMENTAL_COMPACTION
   };
 
-  virtual bool IsPregenerated(Isolate* isolate) V8_OVERRIDE;
-  static void GenerateFixedRegStubsAheadOfTime(Isolate* isolate);
   virtual bool SometimesSetsUpAFrame() { return false; }
 
   static void PatchBranchIntoNop(MacroAssembler* masm, int pos) {