Allow inlining of functions containing %_ArgumentsLength.

src/ast.cc

Index: src/ast.cc
diff --git a/src/ast.cc b/src/ast.cc
index 53d27999ea073768fd0f879121cddf7964974732..bf16b9c076b8786ce1cb4a2eecf4963f79d70fe9 100644
--- a/src/ast.cc
+++ b/src/ast.cc
@@ -1117,11 +1117,9 @@ void AstConstructionVisitor::VisitCallRuntime(CallRuntime* node) {
     // 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);
   }
 }