[intrinsics] Kill the %_IsMinusZero intrinsic.

src/crankshaft/hydrogen-range-analysis.cc

 // Copyright 2013 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/crankshaft/hydrogen-range-analysis.h"
 
 namespace v8 {
 namespace internal {
 
 
@@ skipping 53 matching lines @@
         // Propagate flags for negative zero checks upwards from conversions
         // int32-to-tagged and int32-to-double.
         Representation from = instr->value()->representation();
         DCHECK(from.Equals(instr->from()));
         if (from.IsSmiOrInteger32()) {
           DCHECK(instr->to().IsTagged() ||
                 instr->to().IsDouble() ||
                 instr->to().IsSmiOrInteger32());
           PropagateMinusZeroChecks(instr->value());
         }
-      } else if (value->IsCompareMinusZeroAndBranch()) {
-        HCompareMinusZeroAndBranch* instr =
-            HCompareMinusZeroAndBranch::cast(value);
-        if (instr->value()->representation().IsSmiOrInteger32()) {
-          PropagateMinusZeroChecks(instr->value());
-        }
       }
     }
 
     // Continue analysis in all dominated blocks.
     const ZoneList<HBasicBlock*>* dominated_blocks(block->dominated_blocks());
     if (!dominated_blocks->is_empty()) {
       // Continue with first dominated block, and push the
       // remaining blocks on the stack (in reverse order).
       int last_changed_range = changed_ranges_.length();
       for (int i = dominated_blocks->length() - 1; i > 0; --i) {
@@ skipping 192 matching lines @@
   }
 
   in_worklist_.Clear();
   DCHECK(in_worklist_.IsEmpty());
   DCHECK(worklist_.is_empty());
 }
 
 
 }  // namespace internal
 }  // namespace v8