Compile and simulate first dart function on arm generated from ast.

runtime/vm/constants_mips.h

 // 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.
 
 #ifndef VM_CONSTANTS_MIPS_H_
 #define VM_CONSTANTS_MIPS_H_
 
 namespace dart {
 
 enum Register {
   ZR =  0,
   AT =  1,
+  kFirstFreeCpuRegister = 2,
   V0 =  2,
   V1 =  3,
   A0 =  4,
   A1 =  5,
   A2 =  6,
   A3 =  7,
   T0 =  8,
   T1 =  9,
   T2 = 10,
   T3 = 11,
   T4 = 12,
   T5 = 13,
   T6 = 14,
   T7 = 15,
   S0 = 16,
   S1 = 17,
   S2 = 18,
   S3 = 19,
   S4 = 20,
   S5 = 21,
   S6 = 22,
   S7 = 23,
   T8 = 24,
   T9 = 25,
+  kLastFreeCpuRegister = 25,
   K0 = 26,
   K1 = 27,
   GP = 28,
   SP = 29,
   FP = 30,
   RA = 31,
   kNumberOfCpuRegisters = 32,
   kNoRegister = -1,
 };
 
@@ skipping 37 matching lines @@
 };
 
 
 // Architecture independent aliases.
 typedef FRegister FpuRegister;
 const FpuRegister FpuTMP = F0;
 const int kNumberOfFpuRegisters = kNumberOfFRegisters;
 
 
 // Register aliases.
-const Register TMP = AT;
-const Register CTX = S7;  // Caches current context in generated code.
-const Register SPREG = SP;
-const Register FPREG = FP;
+const Register TMP = AT;  // Used as scratch register by assembler.
+const Register CTX = S6;  // Caches current context in generated code.
+const Register PP = S7;  // Caches object pool pointer in generated code.
+const Register SPREG = SP;  // Stack pointer register.
+const Register FPREG = FP;  // Frame pointer register.
 
 
 // Values for the condition field.  // UNIMPLEMENTED.
 enum Condition {
   kNoCondition = -1,
   kMaxCondition = 16,
 };
 
 }  // namespace dart
 
 #endif  // VM_CONSTANTS_MIPS_H_