[runtime] Introduce FastNewStrictArgumentsStub to optimize strict arguments.

src/full-codegen/arm/full-codegen-arm.cc

Index: src/full-codegen/arm/full-codegen-arm.cc
diff --git a/src/full-codegen/arm/full-codegen-arm.cc b/src/full-codegen/arm/full-codegen-arm.cc
index e3a4fabf520d34c3b107e3d6331cc7e1951170d6..97e779e0605bdfb28e6ee267d036ec1ef42a6518 100644
--- a/src/full-codegen/arm/full-codegen-arm.cc
+++ b/src/full-codegen/arm/full-codegen-arm.cc
@@ -270,28 +270,32 @@ void FullCodeGenerator::Generate() {
   if (arguments != NULL) {
     // Function uses arguments object.
     Comment cmnt(masm_, "[ Allocate arguments object");
-    DCHECK(r1.is(ArgumentsAccessNewDescriptor::function()));
     if (!function_in_register_r1) {
       // Load this again, if it's used by the local context below.
       __ ldr(r1, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
     }
-    // Receiver is just before the parameters on the caller's stack.
-    int num_parameters = info->scope()->num_parameters();
-    int offset = num_parameters * kPointerSize;
-    __ mov(ArgumentsAccessNewDescriptor::parameter_count(),
-           Operand(Smi::FromInt(num_parameters)));
-    __ add(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.
-    bool is_unmapped = is_strict(language_mode()) || !has_simple_parameters();
-    ArgumentsAccessStub::Type type = ArgumentsAccessStub::ComputeType(
-        is_unmapped, literal()->has_duplicate_parameters());
-    ArgumentsAccessStub stub(isolate(), type);
-    __ CallStub(&stub);
+    if (is_strict(language_mode()) || !has_simple_parameters()) {
+      FastNewStrictArgumentsStub stub(isolate());
+      __ CallStub(&stub);
+    } else {
+      DCHECK(r1.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;
+      __ mov(ArgumentsAccessNewDescriptor::parameter_count(),
+             Operand(Smi::FromInt(num_parameters)));
+      __ add(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);
+      __ CallStub(&stub);
+    }
 
     SetVar(arguments, r0, r1, r2);
   }