[fullcodegen] Factor out EmitNewClosure from architectures.

src/full-codegen/full-codegen.cc

Index: src/full-codegen/full-codegen.cc
diff --git a/src/full-codegen/full-codegen.cc b/src/full-codegen/full-codegen.cc
index 1cfa016564011bcec52cd454187a8cea3dec2057..ee5687175b5c9c98f0b03959e72aba04f8856e7e 100644
--- a/src/full-codegen/full-codegen.cc
+++ b/src/full-codegen/full-codegen.cc
@@ -1007,6 +1007,30 @@ void FullCodeGenerator::EmitUnwindAndReturn() {
   EmitReturnSequence();
 }
 
+void FullCodeGenerator::EmitNewClosure(Handle<SharedFunctionInfo> info,
+                                       bool pretenure) {
+  // Use the fast case closure allocation code that allocates in new
+  // space for nested functions that don't need literals cloning. If
+  // we're running with the --always-opt or the --prepare-always-opt
+  // flag, we need to use the runtime function so that the new function
+  // we are creating here gets a chance to have its code optimized and
+  // doesn't just get a copy of the existing unoptimized code.
+  if (!FLAG_always_opt &&
+      !FLAG_prepare_always_opt &&
+      !pretenure &&
+      scope()->is_function_scope() &&
+      info->num_literals() == 0) {
+    FastNewClosureStub stub(isolate(), info->language_mode(), info->kind());
+    __ Move(stub.GetCallInterfaceDescriptor().GetRegisterParameter(0), info);
+    __ CallStub(&stub);
+  } else {
+    __ Push(info);
+    __ CallRuntime(pretenure ? Runtime::kNewClosure_Tenured
+                             : Runtime::kNewClosure);
+  }
+  context()->Plug(result_register());
+}
+
 void FullCodeGenerator::EmitNamedPropertyLoad(Property* prop) {
   SetExpressionPosition(prop);
   Literal* key = prop->key()->AsLiteral();