[cfe-commits] Patch for PR7409 - Reduce number of warnings for invalid typedefs

[Richard Trieu]

Patch for PR7409.  Remove multiple error on invalid typedefs.  Once the
first error is emitted, suppress additional errors when using the invalid
typedefs.  Also, change the handling of types inside instantiations to be
more descriptive.

Patch attached and available in Code Review:
http://codereview.appspot.com/4430069/
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