Allow inlining of functions containing %_Arguments.

src/ast.cc

Index: src/ast.cc
diff --git a/src/ast.cc b/src/ast.cc
index bf16b9c076b8786ce1cb4a2eecf4963f79d70fe9..8d25bacfa6dda99b2ea7decf71e582c2bc6c1caa 100644
--- a/src/ast.cc
+++ b/src/ast.cc
@@ -1116,11 +1116,6 @@ void AstConstructionVisitor::VisitCallRuntime(CallRuntime* node) {
     // 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("_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);
   }
 }