[crankshaft] Remove the useless HAllocateBlockContext instruction.

src/crankshaft/ia32/lithium-ia32.h

Index: src/crankshaft/ia32/lithium-ia32.h
diff --git a/src/crankshaft/ia32/lithium-ia32.h b/src/crankshaft/ia32/lithium-ia32.h
index f421c7e391be3a36d5dbbcc95f883f049cb2b59f..e22ab437fc692a1de6d5b7ff079731c07ff02527 100644
--- a/src/crankshaft/ia32/lithium-ia32.h
+++ b/src/crankshaft/ia32/lithium-ia32.h
@@ -24,7 +24,6 @@ class LCodeGen;
 #define LITHIUM_CONCRETE_INSTRUCTION_LIST(V) \
   V(AccessArgumentsAt)                       \
   V(AddI)                                    \
-  V(AllocateBlockContext)                    \
   V(Allocate)                                \
   V(ApplyArguments)                          \
   V(ArgumentsElements)                       \
@@ -2555,23 +2554,6 @@ class LStoreFrameContext: public LTemplateInstruction<0, 1, 0> {
 };
 
 
-class LAllocateBlockContext: public LTemplateInstruction<1, 2, 0> {
- public:
-  LAllocateBlockContext(LOperand* context, LOperand* function) {
-    inputs_[0] = context;
-    inputs_[1] = function;
-  }
-
-  LOperand* context() { return inputs_[0]; }
-  LOperand* function() { return inputs_[1]; }
-
-  Handle<ScopeInfo> scope_info() { return hydrogen()->scope_info(); }
-
-  DECLARE_CONCRETE_INSTRUCTION(AllocateBlockContext, "allocate-block-context")
-  DECLARE_HYDROGEN_ACCESSOR(AllocateBlockContext)
-};
-
-
 class LChunkBuilder;
 class LPlatformChunk final : public LChunk {
  public: