Background compilation work:

runtime/vm/assembler_arm.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"  // NOLINT
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/assembler.h"
 #include "vm/cpu.h"
 #include "vm/longjump.h"
@@ skipping 1498 matching lines @@
     } else {
       LoadImmediate(rd, offset_hi, cond);
       add(rd, pp, Operand(rd), cond);
     }
     ldr(rd, Address(rd, offset_lo), cond);
   }
 }
 
 void Assembler::CheckCodePointer() {
 #ifdef DEBUG
+  Comment("CheckCodePointer");
   Label cid_ok, instructions_ok;
   Push(R0);
   Push(IP);
   CompareClassId(CODE_REG, kCodeCid, R0);
   b(&cid_ok, EQ);
   bkpt(0);
   Bind(&cid_ok);
 
   const intptr_t offset = CodeSize() + Instr::kPCReadOffset +
       Instructions::HeaderSize() - kHeapObjectTag;
@@ skipping 1716 matching lines @@
   // Reserve space for arguments and align frame before entering
   // the C++ world.
   AddImmediate(SP, -frame_space);
   if (OS::ActivationFrameAlignment() > 1) {
     bic(SP, SP, Operand(OS::ActivationFrameAlignment() - 1));
   }
 }
 
 
 void Assembler::EnterCallRuntimeFrame(intptr_t frame_space) {
+  Comment("EnterCallRuntimeFrame");
   // Preserve volatile CPU registers and PP.
   EnterFrame(kDartVolatileCpuRegs | (1 << PP) | (1 << FP), 0);
   COMPILE_ASSERT((kDartVolatileCpuRegs & (1 << PP)) == 0);
 
   // Preserve all volatile FPU registers.
   if (TargetCPUFeatures::vfp_supported()) {
     DRegister firstv = EvenDRegisterOf(kDartFirstVolatileFpuReg);
     DRegister lastv = OddDRegisterOf(kDartLastVolatileFpuReg);
     if ((lastv - firstv + 1) >= 16) {
       DRegister mid = static_cast<DRegister>(firstv + 16);
@@ skipping 387 matching lines @@
 
 
 const char* Assembler::FpuRegisterName(FpuRegister reg) {
   ASSERT((0 <= reg) && (reg < kNumberOfFpuRegisters));
   return fpu_reg_names[reg];
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM