Subzero: Use C++11 member initializers where practical.

src/IceAssembler.cpp

 //===- subzero/src/IceAssembler.cpp - Assembler base class ----------------===//
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 //
 // Modified by the Subzero authors.
 //
 // This is forked from Dart revision 39313.
 // Please update the revision if we merge back changes from Dart.
 // https://code.google.com/p/dart/wiki/GettingTheSource
@@ skipping 70 matching lines @@
   Limit = computeLimit(Contents, kInitialBufferCapacity);
 #ifndef NDEBUG
   HasEnsuredCapacity = false;
 #endif // !NDEBUG
 
   // Verify internal state.
   assert(capacity() == kInitialBufferCapacity);
   assert(size() == 0);
 }
 
-AssemblerBuffer::~AssemblerBuffer() {}
+AssemblerBuffer::~AssemblerBuffer() = default;
 
 void AssemblerBuffer::extendCapacity() {
   intptr_t old_size = size();
   intptr_t old_capacity = capacity();
   const intptr_t OneMB = 1 << 20;
   intptr_t new_capacity = std::min(old_capacity * 2, old_capacity + OneMB);
   if (new_capacity < old_capacity) {
     llvm::report_fatal_error(
         "Unexpected overflow in AssemblerBuffer::ExtendCapacity");
   }
@@ skipping 43 matching lines @@
   }
   // Handle any bytes that are not prefixed by a fixup.
   for (intptr_t i = CurPosition; i < EndPosition; ++i) {
     Str << "\t.byte 0x";
     Str.write_hex(Buffer.load<uint8_t>(i));
     Str << "\n";
   }
 }
 
 } // end of namespace Ice