Reland "Allow inlining of functions containing %_ArgumentsLength."

src/ast.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/ast.h"
 
 #include <cmath>  // For isfinite.
 #include "src/builtins.h"
 #include "src/code-stubs.h"
 #include "src/contexts.h"
@@ skipping 1099 matching lines @@
 DONT_CACHE_NODE(ModuleLiteral)
 
 
 void AstConstructionVisitor::VisitCallRuntime(CallRuntime* node) {
   increase_node_count();
   if (node->is_jsruntime()) {
     // Don't try to inline JS runtime calls because we don't (currently) even
     // optimize them.
     add_flag(kDontInline);
   } else if (node->function()->intrinsic_type == Runtime::INLINE &&
-             (node->raw_name()->IsOneByteEqualTo("_ArgumentsLength") ||
-              node->raw_name()->IsOneByteEqualTo("_Arguments"))) {
-    // Don't inline the %_ArgumentsLength or %_Arguments because their
-    // implementation will not work.  There is no stack frame to get them
-    // from.
+             node->raw_name()->IsOneByteEqualTo("_Arguments")) {
+    // Don't inline the %_Arguments because it's implementation will not work.
+    // There is no stack frame to get them from.
     add_flag(kDontInline);
   }
 }
 
 #undef REGULAR_NODE
 #undef DONT_OPTIMIZE_NODE
 #undef DONT_SELFOPTIMIZE_NODE
 #undef DONT_CACHE_NODE
 
 
 Handle<String> Literal::ToString() {
   if (value_->IsString()) return value_->AsString()->string();
   ASSERT(value_->IsNumber());
   char arr[100];
   Vector<char> buffer(arr, ARRAY_SIZE(arr));
   const char* str;
   if (value()->IsSmi()) {
     // Optimization only, the heap number case would subsume this.
     SNPrintF(buffer, "%d", Smi::cast(*value())->value());
     str = arr;
   } else {
     str = DoubleToCString(value()->Number(), buffer);
   }
   return isolate_->factory()->NewStringFromAsciiChecked(str);
 }
 
 
 } }  // namespace v8::internal