Fix typo in comment.

src/codegen-ia32.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 71 matching lines @@
   // the expression stack, and it is left in place with its value above it.
   void GetValue(TypeofState typeof_state);
 
   // Generate code to push the value of a reference on top of the expression
   // stack and then spill the stack frame.  This function is used temporarily
   // while the code generator is being transformed.
   inline void GetValueAndSpill(TypeofState typeof_state);
 
   // Like GetValue except that the slot is expected to be written to before
   // being read from again.  Thae value of the reference may be invalidated,
-  // causign subsequent attempts to read it to fail.
+  // causing subsequent attempts to read it to fail.
   void TakeValue(TypeofState typeof_state);
 
   // Generate code to store the value on top of the expression stack in the
   // reference.  The reference is expected to be immediately below the value
   // on the expression stack.  The stored value is left in place (with the
   // reference intact below it) to support chained assignments.
   void SetValue(InitState init_state);
 
  private:
   CodeGenerator* cgen_;
@@ skipping 401 matching lines @@
   cgen_->set_in_spilled_code(false);
   GetValue(typeof_state);
   cgen_->frame()->SpillAll();
   cgen_->set_in_spilled_code(true);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_CODEGEN_IA32_H_