Replace OStream with std::ostream.

src/compiler/arm64/instruction-selector-arm64-unittest.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 <list>
 
 #include "src/compiler/instruction-selector-unittest.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 978 matching lines @@
 
 struct MemoryAccess {
   MachineType type;
   ArchOpcode ldr_opcode;
   ArchOpcode str_opcode;
   const int32_t immediates[20];
 };
 
 
 std::ostream& operator<<(std::ostream& os, const MemoryAccess& memacc) {
-  OStringStream ost;
-  ost << memacc.type;
-  return os << ost.c_str();
+  return os << memacc.type;
 }
 
 }  // namespace
 
 
 static const MemoryAccess kMemoryAccesses[] = {
     {kMachInt8, kArm64Ldrsb, kArm64Strb,
      {-256, -255, -3, -2, -1, 0, 1, 2, 3, 255, 256, 257, 258, 1000, 1001,
       2121, 2442, 4093, 4094, 4095}},
     {kMachUint8, kArm64Ldrb, kArm64Strb,
@@ skipping 376 matching lines @@
     ASSERT_EQ(1U, s.size());
     EXPECT_EQ(kArm64Not, s[0]->arch_opcode());
     EXPECT_EQ(1U, s[0]->InputCount());
     EXPECT_EQ(1U, s[0]->OutputCount());
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8