Revert "Revert "Reland 21774: Generate KeyedLoadGeneric with Hydrogen""

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index 818569b0919b0441bcb7a8f68b139c346e0d590c..9260b58cd38a2cfa6a89cb0be39bee81f0e45d88 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -1309,6 +1309,16 @@ class HGraphBuilder {
   HBasicBlock* CreateBasicBlock(HEnvironment* env);
   HBasicBlock* CreateLoopHeaderBlock();
 
+  template <class BitFieldClass>
+  HValue* BuildDecodeField(HValue* encoded_field) {
+    HValue* shifted_field = AddUncasted<HShr>(encoded_field,
+        Add<HConstant>(static_cast<int>(BitFieldClass::kShift)));
+    HValue* mask_value = Add<HConstant>(static_cast<int>(BitFieldClass::kMask));
+    return AddUncasted<HBitwise>(Token::BIT_AND, shifted_field, mask_value);
+  }
+
+  HValue* BuildGetElementsKind(HValue* object);
+
   HValue* BuildCheckHeapObject(HValue* object);
   HValue* BuildCheckString(HValue* string);
   HValue* BuildWrapReceiver(HValue* object, HValue* function);
@@ -1335,8 +1345,32 @@ class HGraphBuilder {
 
   HValue* BuildNumberToString(HValue* object, Type* type);
 
+  void BuildJSObjectCheck(HValue* receiver,
+                          int bit_field_mask);
+
+  // Checks a key value that's being used for a keyed element access context. If
+  // the key is a index, i.e. a smi or a number in a unique string with a cached
+  // numeric value, the "true" of the continuation is joined. Otherwise,
+  // if the key is a name or a unique string, the "false" of the continuation is
+  // joined. Otherwise, a deoptimization is triggered. In both paths of the
+  // continuation, the key is pushed on the top of the environment.
+  void BuildKeyedIndexCheck(HValue* key,
+                            HIfContinuation* join_continuation);
+
+  // Checks the properties of an object if they are in dictionary case, in which
+  // case "true" of continuation is taken, otherwise the "false"
+  void BuildTestForDictionaryProperties(HValue* object,
+                                        HIfContinuation* continuation);
+
+  void BuildNonGlobalObjectCheck(HValue* receiver);
+
+  HValue* BuildKeyedLookupCacheHash(HValue* object,
+                                    HValue* key);
+
   HValue* BuildUncheckedDictionaryElementLoad(HValue* receiver,
-                                              HValue* key);
+                                              HValue* elements,
+                                              HValue* key,
+                                              HValue* hash);
 
   HValue* BuildRegExpConstructResult(HValue* length,
                                      HValue* index,
@@ -1674,6 +1708,27 @@ class HGraphBuilder {
     bool finished_;
   };
 
+  template <class A, class P1>
+  void DeoptimizeIf(P1 p1, char* const reason) {
+    IfBuilder builder(this);
+    builder.If<A>(p1);
+    builder.ThenDeopt(reason);
+  }
+
+  template <class A, class P1, class P2>
+  void DeoptimizeIf(P1 p1, P2 p2, const char* reason) {
+    IfBuilder builder(this);
+    builder.If<A>(p1, p2);
+    builder.ThenDeopt(reason);
+  }
+
+  template <class A, class P1, class P2, class P3>
+  void DeoptimizeIf(P1 p1, P2 p2, P3 p3, const char* reason) {
+    IfBuilder builder(this);
+    builder.If<A>(p1, p2, p3);
+    builder.ThenDeopt(reason);
+  }
+
   HValue* BuildNewElementsCapacity(HValue* old_capacity);
 
   class JSArrayBuilder V8_FINAL {