Make stack_parameter_count a plain register.

src/arm/code-stubs-arm.cc

Index: src/arm/code-stubs-arm.cc
diff --git a/src/arm/code-stubs-arm.cc b/src/arm/code-stubs-arm.cc
index 5c5231bb8861f2c5be13e52e4c8b54cac5ebefa8..bdcdbf81dd7a8614975d669e2daa9b60d9dd9863 100644
--- a/src/arm/code-stubs-arm.cc
+++ b/src/arm/code-stubs-arm.cc
@@ -192,7 +192,7 @@ static void InitializeArrayConstructorDescriptor(
   descriptor->register_param_count_ = 2;
   if (constant_stack_parameter_count != 0) {
     // stack param count needs (constructor pointer, and single argument)
-    descriptor->stack_parameter_count_ = &r0;
+    descriptor->stack_parameter_count_ = r0;
   }
   descriptor->hint_stack_parameter_count_ = constant_stack_parameter_count;
   descriptor->register_params_ = registers;
@@ -214,7 +214,7 @@ static void InitializeInternalArrayConstructorDescriptor(
 
   if (constant_stack_parameter_count != 0) {
     // stack param count needs (constructor pointer, and single argument)
-    descriptor->stack_parameter_count_ = &r0;
+    descriptor->stack_parameter_count_ = r0;
   }
   descriptor->hint_stack_parameter_count_ = constant_stack_parameter_count;
   descriptor->register_params_ = registers;