VM: Support phis with pair representations.

runtime/vm/intermediate_language_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"  // Needed here to get TARGET_ARCH_ARM.
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/cpu.h"
@@ skipping 6203 matching lines @@
         reinterpret_cast<int32_t>(locs()->in(1).constant().raw()) >> 1;
     switch (op_kind()) {
       case Token::kSHR: {
         if (shift < 32) {
           __ Lsl(out_lo, left_hi, Operand(32 - shift));
           __ orr(out_lo, out_lo, Operand(left_lo, LSR, shift));
           __ Asr(out_hi, left_hi, Operand(shift));
         } else {
           if (shift == 32) {
             __ mov(out_lo, Operand(left_hi));
+          } else if (shift < 64) {
+            __ Asr(out_lo, left_hi, Operand(shift - 32));
           } else {
-            __ Asr(out_lo, left_hi, Operand(shift - 32));
+            __ Asr(out_lo, left_hi, Operand(31));
           }
           __ Asr(out_hi, left_hi, Operand(31));
         }
         break;
       }
       case Token::kSHL: {
+        ASSERT(shift < 64);
         if (shift < 32) {
           __ Lsr(out_hi, left_lo, Operand(32 - shift));
           __ orr(out_hi, out_hi, Operand(left_hi, LSL, shift));
           __ Lsl(out_lo, left_lo, Operand(shift));
         } else {
           if (shift == 32) {
             __ mov(out_hi, Operand(left_lo));
           } else {
             __ Lsl(out_hi, left_lo, Operand(shift - 32));
           }
@@ skipping 615 matching lines @@
                                 1,
                                 locs());
   __ Drop(1);
   __ Pop(result);
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM