Further minify non-visible JavaScript.

LICENSE

 This license applies to all parts of V8 that are not externally
 maintained libraries.  The externally maintained libraries used by V8
 are:
 
   - Jscre, located under third_party/jscre.  This code is copyrighted
     by the University of Cambridge and Apple Inc. and released under a
     2-clause BSD license.
 
   - Dtoa, located under third_party/dtoa.  This code is copyrighted by
     David M. Gay and released under an MIT license.
 
   - Strongtalk assembler, the basis of the files assembler-arm-inl.h,
     assembler-arm.cc, assembler-arm.h, assembler-ia32-inl.h,
     assembler-ia32.cc, assembler-ia32.h, assembler.cc and assembler.h.
     This code is copyrighted by Sun Microsystems Inc. and released
     under a 3-clause BSD license.
 
+  - JSMin JavaScript minifier, located at tools/jsmin.py.  This code is
+    copyrighted by Douglas Crockford and Baruch Even and released under
+    an MIT license.
+
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 as their terms may differ from the terms below.
 
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