ARM: Fix bugs in softfloat code path.

src/arm/code-stubs-arm.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2616 matching lines @@
                                       BinaryOpIC::TypeInfo left_type,
                                       BinaryOpIC::TypeInfo right_type,
                                       bool smi_operands,
                                       Label* not_numbers,
                                       Label* gc_required,
                                       Label* miss,
                                       Token::Value op,
                                       OverwriteMode mode) {
   Register left = r1;
   Register right = r0;
-  Register scratch1 = r7;
-  Register scratch2 = r9;
+  Register scratch1 = r6;
+  Register scratch2 = r7;
   Register scratch3 = r4;
 
   ASSERT(smi_operands || (not_numbers != NULL));
   if (smi_operands) {
     __ AssertSmi(left);
     __ AssertSmi(right);
   }
   if (left_type == BinaryOpIC::SMI) {
     __ JumpIfNotSmi(left, miss);
   }
   if (right_type == BinaryOpIC::SMI) {
     __ JumpIfNotSmi(right, miss);
   }
 
-  Register heap_number_map = r6;
+  Register heap_number_map = r9;
   __ LoadRoot(heap_number_map, Heap::kHeapNumberMapRootIndex);
 
   switch (op) {
     case Token::ADD:
     case Token::SUB:
     case Token::MUL:
     case Token::DIV:
     case Token::MOD: {
       // Load left and right operands into d6 and d7 or r0/r1 and r2/r3
       // depending on whether VFP3 is available or not.
@@ skipping 5398 matching lines @@
 
   __ Pop(lr, r5, r1);
   __ Ret();
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM