[wasm] Int64Lowering of Int64Sub on ia32 and arm.

src/compiler/raw-machine-assembler.h

 // Copyright 2014 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_RAW_MACHINE_ASSEMBLER_H_
 #define V8_COMPILER_RAW_MACHINE_ASSEMBLER_H_
 
 #include "src/assembler.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/graph.h"
@@ skipping 309 matching lines @@
   }
   Node* Uint64Div(Node* a, Node* b) {
     return AddNode(machine()->Uint64Div(), a, b);
   }
   Node* Uint64Mod(Node* a, Node* b) {
     return AddNode(machine()->Uint64Mod(), a, b);
   }
   Node* Int32PairAdd(Node* a_low, Node* a_high, Node* b_low, Node* b_high) {
     return AddNode(machine()->Int32PairAdd(), a_low, a_high, b_low, b_high);
   }
+  Node* Int32PairSub(Node* a_low, Node* a_high, Node* b_low, Node* b_high) {
+    return AddNode(machine()->Int32PairSub(), a_low, a_high, b_low, b_high);
+  }
   Node* Word32PairShl(Node* low_word, Node* high_word, Node* shift) {
     return AddNode(machine()->Word32PairShl(), low_word, high_word, shift);
   }
   Node* Word32PairShr(Node* low_word, Node* high_word, Node* shift) {
     return AddNode(machine()->Word32PairShr(), low_word, high_word, shift);
   }
   Node* Word32PairSar(Node* low_word, Node* high_word, Node* shift) {
     return AddNode(machine()->Word32PairSar(), low_word, high_word, shift);
   }
 
@@ skipping 385 matching lines @@
   bool deferred_;
   friend class RawMachineAssembler;
   DISALLOW_COPY_AND_ASSIGN(RawMachineLabel);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_RAW_MACHINE_ASSEMBLER_H_