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

src/mips/macro-assembler-mips.h

Index: src/mips/macro-assembler-mips.h
===================================================================
--- src/mips/macro-assembler-mips.h	(revision 10367)
+++ src/mips/macro-assembler-mips.h	(working copy)
@@ -799,7 +799,7 @@
   // -------------------------------------------------------------------------
   // JavaScript invokes.
 
-  // Setup call kind marking in t1. The method takes t1 as an
+  // Set up call kind marking in t1. The method takes t1 as an
   // explicit first parameter to make the code more readable at the
   // call sites.
   void SetCallKind(Register dst, CallKind kind);