Revert r20974: Unify and simplify the FastCloneShallowArrayStub

src/arm64/code-stubs-arm64.cc

Index: src/arm64/code-stubs-arm64.cc
diff --git a/src/arm64/code-stubs-arm64.cc b/src/arm64/code-stubs-arm64.cc
index c726abba7cd8b21f10d74a74799b5a23113113b8..853c2c76eaad16d943eec2953ff060dd016fd898 100644
--- a/src/arm64/code-stubs-arm64.cc
+++ b/src/arm64/code-stubs-arm64.cc
@@ -88,11 +88,6 @@ void FastCloneShallowArrayStub::InitializeInterfaceDescriptor(
   static Register registers[] = { x3, x2, x1 };
   descriptor->register_param_count_ = sizeof(registers) / sizeof(registers[0]);
   descriptor->register_params_ = registers;
-  static Representation representations[] = {
-    Representation::Tagged(),
-    Representation::Smi(),
-    Representation::Tagged() };
-  descriptor->register_param_representations_ = representations;
   descriptor->deoptimization_handler_ =
       Runtime::FunctionForId(
           Runtime::kHiddenCreateArrayLiteralStubBailout)->entry;
@@ -258,11 +253,6 @@ static void InitializeArrayConstructorDescriptor(
     descriptor->register_param_count_ =
         sizeof(registers_variable_args) / sizeof(registers_variable_args[0]);
     descriptor->register_params_ = registers_variable_args;
-    static Representation representations[] = {
-        Representation::Tagged(),
-        Representation::Tagged(),
-        Representation::Integer32() };
-    descriptor->register_param_representations_ = representations;
   }
 
   descriptor->hint_stack_parameter_count_ = constant_stack_parameter_count;
@@ -309,10 +299,6 @@ static void InitializeInternalArrayConstructorDescriptor(
     descriptor->register_param_count_ =
         sizeof(registers_variable_args) / sizeof(registers_variable_args[0]);
     descriptor->register_params_ = registers_variable_args;
-    static Representation representations[] = {
-        Representation::Tagged(),
-        Representation::Integer32() };
-    descriptor->register_param_representations_ = representations;
   }
 
   descriptor->hint_stack_parameter_count_ = constant_stack_parameter_count;