[runtime] Remove the unused weird %Likely and %Unlikely intrinsics.

src/compiler/js-intrinsic-lowering.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/js-intrinsic-lowering.h"
 
 #include <stack>
 
 #include "src/code-factory.h"
 #include "src/compiler/access-builder.h"
@@ skipping 45 matching lines @@
     case Runtime::kInlineIsTypedArray:
       return ReduceIsInstanceType(node, JS_TYPED_ARRAY_TYPE);
     case Runtime::kInlineIsFunction:
       return ReduceIsInstanceType(node, JS_FUNCTION_TYPE);
     case Runtime::kInlineIsRegExp:
       return ReduceIsInstanceType(node, JS_REGEXP_TYPE);
     case Runtime::kInlineIsSmi:
       return ReduceIsSmi(node);
     case Runtime::kInlineJSValueGetValue:
       return ReduceJSValueGetValue(node);
-    case Runtime::kInlineLikely:
-      return ReduceUnLikely(node, BranchHint::kTrue);
     case Runtime::kInlineMapGetInstanceType:
       return ReduceMapGetInstanceType(node);
     case Runtime::kInlineMathClz32:
       return ReduceMathClz32(node);
     case Runtime::kInlineMathFloor:
       return ReduceMathFloor(node);
     case Runtime::kInlineMathSqrt:
       return ReduceMathSqrt(node);
     case Runtime::kInlineOneByteSeqStringGetChar:
       return ReduceSeqStringGetChar(node, String::ONE_BYTE_ENCODING);
     case Runtime::kInlineOneByteSeqStringSetChar:
       return ReduceSeqStringSetChar(node, String::ONE_BYTE_ENCODING);
     case Runtime::kInlineStringGetLength:
       return ReduceStringGetLength(node);
     case Runtime::kInlineTwoByteSeqStringGetChar:
       return ReduceSeqStringGetChar(node, String::TWO_BYTE_ENCODING);
     case Runtime::kInlineTwoByteSeqStringSetChar:
       return ReduceSeqStringSetChar(node, String::TWO_BYTE_ENCODING);
-    case Runtime::kInlineUnlikely:
-      return ReduceUnLikely(node, BranchHint::kFalse);
     case Runtime::kInlineValueOf:
       return ReduceValueOf(node);
     case Runtime::kInlineIsMinusZero:
       return ReduceIsMinusZero(node);
     case Runtime::kInlineFixedArrayGet:
       return ReduceFixedArrayGet(node);
     case Runtime::kInlineFixedArraySet:
       return ReduceFixedArraySet(node);
     case Runtime::kInlineGetTypeFeedbackVector:
       return ReduceGetTypeFeedbackVector(node);
@@ skipping 236 matching lines @@
 
 Reduction JSIntrinsicLowering::ReduceStringGetLength(Node* node) {
   Node* value = NodeProperties::GetValueInput(node, 0);
   Node* effect = NodeProperties::GetEffectInput(node);
   Node* control = NodeProperties::GetControlInput(node);
   return Change(node, simplified()->LoadField(AccessBuilder::ForStringLength()),
                 value, effect, control);
 }
 
 
-Reduction JSIntrinsicLowering::ReduceUnLikely(Node* node, BranchHint hint) {
-  std::stack<Node*> nodes_to_visit;
-  nodes_to_visit.push(node);
-  while (!nodes_to_visit.empty()) {
-    Node* current = nodes_to_visit.top();
-    nodes_to_visit.pop();
-    for (Node* use : current->uses()) {
-      if (use->opcode() == IrOpcode::kJSToBoolean) {
-        // We have to "look through" ToBoolean calls.
-        nodes_to_visit.push(use);
-      } else if (use->opcode() == IrOpcode::kBranch) {
-        // Actually set the hint on any branch using the intrinsic node.
-        NodeProperties::ChangeOp(use, common()->Branch(hint));
-      }
-    }
-  }
-  // Apart from adding hints to branchs nodes, this is the identity function.
-  Node* value = NodeProperties::GetValueInput(node, 0);
-  ReplaceWithValue(node, value);
-  return Changed(value);
-}
-
-
 Reduction JSIntrinsicLowering::ReduceValueOf(Node* node) {
   // if (%_IsSmi(value)) {
   //   return value;
   // } else if (%_GetInstanceType(%_GetMap(value)) == JS_VALUE_TYPE) {
   //   return %_GetValue(value);
   // } else {
   //   return value;
   // }
   const Operator* const merge_op = common()->Merge(2);
   const Operator* const ephi_op = common()->EffectPhi(2);
@@ skipping 325 matching lines @@
 }
 
 
 SimplifiedOperatorBuilder* JSIntrinsicLowering::simplified() const {
   return jsgraph()->simplified();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8