Ensure we don't clobber the cell on ARM and MIPS

src/mips/code-stubs-mips.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 3239 matching lines @@
     }
   }
 
   // Fast-case: Invoke the function now.
   // a1: pushed function
   ParameterCount actual(argc_);
 
   if (CallAsMethod()) {
     if (NeedsChecks()) {
       // Do not transform the receiver for strict mode functions and natives.
-      __ lw(a2, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
-      __ lw(a3, FieldMemOperand(a2, SharedFunctionInfo::kCompilerHintsOffset));
+      __ lw(a3, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
+      __ lw(a4, FieldMemOperand(a3, SharedFunctionInfo::kCompilerHintsOffset));
       int32_t strict_mode_function_mask =
           1 <<  (SharedFunctionInfo::kStrictModeFunction + kSmiTagSize);
       int32_t native_mask = 1 << (SharedFunctionInfo::kNative + kSmiTagSize);
-      __ And(at, a3, Operand(strict_mode_function_mask | native_mask));
+      __ And(at, a4, Operand(strict_mode_function_mask | native_mask));
       __ Branch(&cont, ne, at, Operand(zero_reg));
     }
 
     // Compute the receiver in non-strict mode.
-    __ lw(a2, MemOperand(sp, argc_ * kPointerSize));
+    __ lw(a3, MemOperand(sp, argc_ * kPointerSize));
 
     if (NeedsChecks()) {
-      // a0: actual number of arguments
-      // a1: function
-      // a2: first argument
-      __ JumpIfSmi(a2, &wrap);
-      __ GetObjectType(a2, a3, a3);
-      __ Branch(&wrap, lt, a3, Operand(FIRST_SPEC_OBJECT_TYPE));
+      __ JumpIfSmi(a3, &wrap);
+      __ GetObjectType(a3, a4, a4);
+      __ Branch(&wrap, lt, a4, Operand(FIRST_SPEC_OBJECT_TYPE));
     } else {
       __ jmp(&wrap);
     }
 
     __ bind(&cont);
   }
   __ InvokeFunction(a1, actual, JUMP_FUNCTION, NullCallWrapper());
 
   if (NeedsChecks()) {
     // Slow-case: Non-function called.
@@ skipping 27 matching lines @@
     __ li(a2, Operand(0, RelocInfo::NONE32));
     __ GetBuiltinFunction(a1, Builtins::CALL_NON_FUNCTION);
     __ Jump(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
             RelocInfo::CODE_TARGET);
   }
 
   if (CallAsMethod()) {
     __ bind(&wrap);
     // Wrap the receiver and patch it back onto the stack.
     { FrameScope frame_scope(masm, StackFrame::INTERNAL);
-      __ Push(a1, a2);
+      __ Push(a1, a3);
       __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
       __ pop(a1);
     }
     __ mov(a0, v0);
     __ sw(a0, MemOperand(sp, argc_ * kPointerSize));
     __ jmp(&cont);
   }
 }
 
 
@@ skipping 2390 matching lines @@
                               MemOperand(fp, 6 * kPointerSize),
                               NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS