MIPS: Drop IsPregenerated() and allow_stub_calls flag.

src/mips/code-stubs-mips.h

Index: src/mips/code-stubs-mips.h
diff --git a/src/mips/code-stubs-mips.h b/src/mips/code-stubs-mips.h
index 10531a80024c855b44da83e6720242e843a13f00..c3e05b8a2d4ed6fc2be614f73911f96abb5cf57e 100644
--- a/src/mips/code-stubs-mips.h
+++ b/src/mips/code-stubs-mips.h
@@ -69,7 +69,6 @@ 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; }
 
@@ -240,7 +239,6 @@ class WriteInt32ToHeapNumberStub : public PlatformCodeStub {
     ASSERT(SignRegisterBits::is_valid(sign_.code()));
   }
 
-  virtual bool IsPregenerated(Isolate* isolate) V8_OVERRIDE;
   static void GenerateFixedRegStubsAheadOfTime(Isolate* isolate);
 
  private:
@@ -291,8 +289,6 @@ 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) {