[turbofan] Implemented the TruncateFloat32ToInt64 TurboFan operator.

src/compiler/operator.h

 // 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.
 
 #ifndef V8_COMPILER_OPERATOR_H_
 #define V8_COMPILER_OPERATOR_H_
 
 #include <ostream>  // NOLINT(readability/streams)
 
 #include "src/base/flags.h"
@@ skipping 12 matching lines @@
 // IR graph.
 // Operators are immutable and describe the statically-known parts of a
 // computation. Thus they can be safely shared by many different nodes in the
 // IR graph, or even globally between graphs. Operators can have "static
 // parameters" which are compile-time constant parameters to the operator, such
 // as the name for a named field access, the ID of a runtime function, etc.
 // Static parameters are private to the operator and only semantically
 // meaningful to the operator itself.
 class Operator : public ZoneObject {
  public:
-  typedef uint8_t Opcode;
+  typedef uint16_t Opcode;
 
   // Properties inform the operator-independent optimizer about legal
   // transformations for nodes that have this operator.
   enum Property {
     kNoProperties = 0,
     kReducible = 1 << 0,    // Participates in strength reduction.
     kCommutative = 1 << 1,  // OP(a, b) == OP(b, a) for all inputs.
     kAssociative = 1 << 2,  // OP(a, OP(b,c)) == OP(OP(a,b), c) for all inputs.
     kIdempotent = 1 << 3,   // OP(a); OP(a) == OP(a).
     kNoRead = 1 << 4,       // Has no scheduling dependency on Effects
@@ skipping 179 matching lines @@
 template <>
 struct OpEqualTo<Handle<ScopeInfo>> : public Handle<ScopeInfo>::equal_to {};
 template <>
 struct OpHash<Handle<ScopeInfo>> : public Handle<ScopeInfo>::hash {};
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_OPERATOR_H_