PPC: [runtime] Turn ArgumentAccessStub into FastNewSloppyArgumentsStub.

Port e0129d0f

Original commit message:
    Turn the fast case of ArgumentsAccessStub into a new stub
    FastNewSloppyArgumentsStub, which is similar to the existing
    FastNewStrictArgumentsStub, although not polished yet, and the slow
    case always went to the runtime anyway, so we can just directly emit
    a runtime call there.

R=bmeurer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1699923002

Cr-Commit-Position: refs/heads/master@{#34005}

src/full-codegen/ppc/full-codegen-ppc.cc

@@ -283,23 +283,11 @@ void FullCodeGenerator::Generate() {
     if (is_strict(language_mode()) || !has_simple_parameters()) {
       FastNewStrictArgumentsStub stub(isolate());
       __ CallStub(&stub);
+    } else if (literal()->has_duplicate_parameters()) {
+      __ Push(r4);
+      __ CallRuntime(Runtime::kNewSloppyArguments_Generic);
     } else {
-      DCHECK(r4.is(ArgumentsAccessNewDescriptor::function()));
-      // Receiver is just before the parameters on the caller's stack.
-      int num_parameters = info->scope()->num_parameters();
-      int offset = num_parameters * kPointerSize;
-      __ LoadSmiLiteral(ArgumentsAccessNewDescriptor::parameter_count(),
-                        Smi::FromInt(num_parameters));
-      __ addi(ArgumentsAccessNewDescriptor::parameter_pointer(), fp,
-              Operand(StandardFrameConstants::kCallerSPOffset + offset));
-
-      // Arguments to ArgumentsAccessStub:
-      //   function, parameter pointer, parameter count.
-      // The stub will rewrite parameter pointer and parameter count if the
-      // previous stack frame was an arguments adapter frame.
-      ArgumentsAccessStub::Type type = ArgumentsAccessStub::ComputeType(
-          literal()->has_duplicate_parameters());
-      ArgumentsAccessStub stub(isolate(), type);
+      FastNewSloppyArgumentsStub stub(isolate());
       __ CallStub(&stub);
     }
 

src/ppc/interface-descriptors-ppc.cc

@@ -54,11 +54,6 @@ const Register StringCompareDescriptor::LeftRegister() { return r4; }
 const Register StringCompareDescriptor::RightRegister() { return r3; }
 
 
-const Register ArgumentsAccessNewDescriptor::function() { return r4; }
-const Register ArgumentsAccessNewDescriptor::parameter_count() { return r5; }
-const Register ArgumentsAccessNewDescriptor::parameter_pointer() { return r6; }
-
-
 const Register ApiGetterDescriptor::function_address() { return r5; }
 
 
@@ -93,6 +88,12 @@ void FastNewRestParameterDescriptor::InitializePlatformSpecific(
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
+void FastNewSloppyArgumentsDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  Register registers[] = {r4};
+  data->InitializePlatformSpecific(arraysize(registers), registers);
+}
+
 void FastNewStrictArgumentsDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {r4};