MIPS: Compile FastCloneShallowArrayStub using Crankshaft.

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 225accc51800376a85c2bc99ab79ed1dec47e52b..233ec8e9ac810c58b46d76e74b9d1d3d0b17a57e 100644
--- a/src/mips/code-stubs-mips.h
+++ b/src/mips/code-stubs-mips.h
@@ -62,11 +62,13 @@ class TranscendentalCacheStub: public PlatformCodeStub {
 class StoreBufferOverflowStub: public PlatformCodeStub {
  public:
   explicit StoreBufferOverflowStub(SaveFPRegsMode save_fp)
-      : save_doubles_(save_fp) { }
+      : save_doubles_(save_fp) {
+    ASSERT(CpuFeatures::IsSafeForSnapshot(FPU) || save_fp == kDontSaveFPRegs);
+  }
 
   void Generate(MacroAssembler* masm);
 
-  virtual bool IsPregenerated();
+  virtual bool IsPregenerated() { return true; }
   static void GenerateFixedRegStubsAheadOfTime(Isolate* isolate);
   virtual bool SometimesSetsUpAFrame() { return false; }