Test tracing of string allocations

runtime/vm/intrinsifier_x64.cc

 // Copyright (c) 2013, 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.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/intrinsifier.h"
 
 #include "vm/assembler.h"
@@ skipping 1709 matching lines @@
 }
 
 
 // Allocates one-byte string of length 'end - start'. The content is not
 // initialized. 'length-reg' contains tagged length.
 // Returns new string as tagged pointer in RAX.
 static void TryAllocateOnebyteString(Assembler* assembler,
                                      Label* ok,
                                      Label* failure,
                                      Register length_reg) {
+  __ MaybeTraceAllocation(kOneByteStringCid, failure, false);
   if (length_reg != RDI) {
     __ movq(RDI, length_reg);
   }
   Label pop_and_fail;
   __ pushq(RDI);  // Preserve length.
   __ SmiUntag(RDI);
   const intptr_t fixed_size = sizeof(RawString) + kObjectAlignment - 1;
   __ leaq(RDI, Address(RDI, TIMES_1, fixed_size));  // RDI is a Smi.
   __ andq(RDI, Immediate(-kObjectAlignment));
 
@@ skipping 276 matching lines @@
   // Set return value to Isolate::current_tag_.
   __ movq(RAX, Address(RBX, Isolate::current_tag_offset()));
   __ ret();
 }
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64