Cosmetic changes ("set up" is a verb, "setup" is a noun).

src/hydrogen.cc

Index: src/hydrogen.cc
===================================================================
--- src/hydrogen.cc	(revision 10367)
+++ src/hydrogen.cc	(working copy)
@@ -2301,7 +2301,7 @@
       Bailout("function with illegal redeclaration");
       return NULL;
     }
-    SetupScope(scope);
+    SetUpScope(scope);
 
     // Add an edge to the body entry.  This is warty: the graph's start
     // environment will be used by the Lithium translation as the initial
@@ -2465,7 +2465,7 @@
 }
 
 
-void HGraphBuilder::SetupScope(Scope* scope) {
+void HGraphBuilder::SetUpScope(Scope* scope) {
   HConstant* undefined_constant = new(zone()) HConstant(
       isolate()->factory()->undefined_value(), Representation::Tagged());
   AddInstruction(undefined_constant);