Fast path for strict closure creation.

src/arm/code-stubs-arm.cc

Index: src/arm/code-stubs-arm.cc
diff --git a/src/arm/code-stubs-arm.cc b/src/arm/code-stubs-arm.cc
index c45b6ab3ccd9679e1ad5f0ac0447aa3c9bf21375..fa9d4e86993aae1895fed00638343e0f81d7205d 100644
--- a/src/arm/code-stubs-arm.cc
+++ b/src/arm/code-stubs-arm.cc
@@ -91,11 +91,15 @@ void FastNewClosureStub::Generate(MacroAssembler* masm) {
                         &gc,
                         TAG_OBJECT);
 
+  int map_index = strict_mode_ == kStrictMode
+      ? Context::FUNCTION_MAP_STRICT_INDEX
+      : Context::FUNCTION_MAP_INDEX;
+
   // Compute the function map in the current global context and set that
   // as the map of the allocated object.
   __ ldr(r2, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX)));
   __ ldr(r2, FieldMemOperand(r2, GlobalObject::kGlobalContextOffset));
-  __ ldr(r2, MemOperand(r2, Context::SlotOffset(Context::FUNCTION_MAP_INDEX)));
+  __ ldr(r2, MemOperand(r2, Context::SlotOffset(map_index)));
   __ str(r2, FieldMemOperand(r0, HeapObject::kMapOffset));
 
   // Initialize the rest of the function. We don't have to update the