Drop the native FastNewBlockContextStub.

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index 63e9f0721bec3b096a2fff4d925b25a7cd63f749..2459cbb650e330a6a92c63078380cd992bab94bd 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -64,7 +64,6 @@ namespace internal {
   V(Interrupt)                           \
   V(FastNewClosure)                      \
   V(FastNewContext)                      \
-  V(FastNewBlockContext)                 \
   V(FastCloneShallowArray)               \
   V(FastCloneShallowObject)              \
   V(CreateAllocationSite)                \
@@ -586,23 +585,6 @@ class FastNewContextStub V8_FINAL : public HydrogenCodeStub {
 };
 
 
-class FastNewBlockContextStub : public PlatformCodeStub {
- public:
-  static const int kMaximumSlots = 64;
-
-  explicit FastNewBlockContextStub(int slots) : slots_(slots) {
-    ASSERT(slots_ > 0 && slots_ <= kMaximumSlots);
-  }
-
-  void Generate(MacroAssembler* masm);
-
- private:
-  int slots_;
-
-  Major MajorKey() { return FastNewBlockContext; }
-  int MinorKey() { return slots_; }
-};
-
 class FastCloneShallowArrayStub : public HydrogenCodeStub {
  public:
   // Maximum length of copied elements array.