[wasm] Int64Lowering of Int64Sub on ia32 and arm.

src/compiler/ppc/instruction-selector-ppc.cc

 // 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.
 
 #include "src/base/adapters.h"
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
 #include "src/ppc/frames-ppc.h"
 
@@ skipping 882 matching lines @@
 
 
 #if V8_TARGET_ARCH_PPC64
 void InstructionSelector::VisitInt64Add(Node* node) {
   VisitBinop<Int64BinopMatcher>(this, node, kPPC_Add, kInt16Imm);
 }
 #endif
 
 #if !V8_TARGET_ARCH_PPC64
 void InstructionSelector::VisitInt32PairAdd(Node* node) { UNIMPLEMENTED(); }
+
+void InstructionSelector::VisitInt32PairSub(Node* node) { UNIMPLEMENTED(); }
 #endif
 
 void InstructionSelector::VisitInt32Sub(Node* node) {
   PPCOperandGenerator g(this);
   Int32BinopMatcher m(node);
   if (m.left().Is(0)) {
     Emit(kPPC_Neg, g.DefineAsRegister(node), g.UseRegister(m.right().node()));
   } else {
     VisitBinop<Int32BinopMatcher>(this, node, kPPC_Sub, kInt16Imm_Negate);
   }
@@ skipping 956 matching lines @@
          MachineOperatorBuilder::kFloat64RoundTruncate |
          MachineOperatorBuilder::kFloat64RoundTiesAway |
          MachineOperatorBuilder::kWord32Popcnt |
          MachineOperatorBuilder::kWord64Popcnt;
   // We omit kWord32ShiftIsSafe as s[rl]w use 0x3f as a mask rather than 0x1f.
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8