Simplify pushing function argument for context allocation.

src/arm/full-codegen-arm.cc

Index: src/arm/full-codegen-arm.cc
diff --git a/src/arm/full-codegen-arm.cc b/src/arm/full-codegen-arm.cc
index 2ee1594f8671227fad384b33ea3192ce531c3a73..06a9dbedd2a56442c753070e0985594743e26659 100644
--- a/src/arm/full-codegen-arm.cc
+++ b/src/arm/full-codegen-arm.cc
@@ -4191,24 +4191,27 @@ void FullCodeGenerator::LoadContextField(Register dst, int context_index) {
 }
 
 
-void FullCodeGenerator::PushFunctionArgumentForContextAllocation() {
+void FullCodeGenerator::PushFunctionArgumentForContextAllocation(
+    Register scratch) {
   Scope* declaration_scope = scope()->DeclarationScope();
   if (declaration_scope->is_global_scope()) {
     // Contexts nested in the global context have a canonical empty function
     // as their closure, not the anonymous closure containing the global
-    // code.  Pass a smi sentinel and let the runtime look up the empty
-    // function.
-    __ mov(ip, Operand(Smi::FromInt(0)));
+    // code.
+    __ ldr(scratch, GlobalObjectOperand());
+    __ ldr(scratch,
+           FieldMemOperand(scratch, GlobalObject::kGlobalContextOffset));
+    __ ldr(scratch, ContextOperand(scratch, Context::CLOSURE_INDEX));
   } else if (declaration_scope->is_eval_scope()) {
     // Contexts created by a call to eval have the same closure as the
     // context calling eval, not the anonymous closure containing the eval
     // code.  Fetch it from the context.
-    __ ldr(ip, ContextOperand(cp, Context::CLOSURE_INDEX));
+    __ ldr(scratch, ContextOperand(cp, Context::CLOSURE_INDEX));
   } else {
     ASSERT(declaration_scope->is_function_scope());
-    __ ldr(ip, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
+    __ ldr(scratch, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
   }
-  __ push(ip);
+  __ push(scratch);
 }